Penguin Ambidextrous Wired Ergonomic Mouse USB, Alleviates RSI, Easy-Glide, Vertical Design, PC Computer & Apple Mac Compatible (Black/Silver, Size: Large)

First, definitely get the wireless any time you buy a mouse these days. Cords are a pain (I do use a corded mini-mouse with my travel computer, but I only use that twice a month when traveling). The mini cable that comes with it will allow you to charge it by USB even while you're using it. The battery lasts a good month or so anyway. It isn't user-replaceable which I'm not happy about, but I'd bet that it's a single AAA lithium that can be replaced with a NiMH from the store. Next, definitely get the standard size. I'm a 6'0" male and have hands maybe a touch large for my height and this is perfect. Women with small hands will want the small size. When I doubt, however, I'd say go for the standard size because I think a small hand would be comfortable on the standard size. If you have large hands, however, DO NOT get the small. Why? Because, as you'll see later, your wrist will not be vertical. Your palm will be rested off to the side to make it low enough for your fingers to hit the buttons. Unless if you want to use your ring and pinkie fingers! :)The build quality is good. No scratches or anything out of the box and seems well built (I've had it about a year now--I keep updating this review). Soft, rubbery material covers it, similar to on the edges of my Blackberry, certain Palm devices from yesteryear, and the same coating on the back of the Barnes & Noble Nook. The rubber coating peeled off my Blackberry after a few years, but that was in and out of my pocket. I say this rubber coating will last many years because the only surface it will contact is my hand. I've tried some of those vertical mice and not only did they have pretty crappy build quality, your hand was NOT vertical! (I bought the $82 Prestige Evoluent online at Best Buy and ended up returning it. It didn't keep my wrist vertical and the plastic didn't fit together properly. I bought some off brands from Ebay too which were like $20 so I bought just to try and I still have them but I never use them because they suck).I don't even know if this is a laser mouse or not but I'm assuming it is because it works on all the shiny surfaces in my house like the dresser that is waxed. My old optical had problems on those surfaces. DPI is great and there's a button on the bottom to change DPI. I just set it where it felt right and forgot about it and use Windows to make fine adjustments in speed, etc. Another thing: the unit puts itself to sleep after exactly 20 seconds to conserve power. You can't change this time. Move it and it wakes up. While it's on, there's an led light on that was annoying at first but I'm used to it. I'd say you could just put a piece of black electrical tape over it like I did with that darn bright LED on my phone's car charger! Or you can take the unit apart to unsolder or break the LED (there's also an orange LED that indicated when it's charging). There's a power button on the bottom which I used to turn on and off but sometimes if you turn it on before Windows boots up it will have trouble syncing with it's mini transmitter (quarter inch and is still in a USB port). I've realized after using the mouse a year that the sleep mode is sufficient. You don't need to turn it on and off to conserve battery life. I'd only turn it off for storage. But if you use it daily just leave it on and it's sensors will take care of the rest.I wanted this because my right wrist was hurting me. All those other vertical mice, including the Zalman FPS Gun mouse do NOT keep your wrist vertical. So, I tried this funky looking Penguin and and got used to it pretty quickly. Do give it a couple weeks, but I think you'll get used to it. And please buy a bunch because when mine goes bad I need this company to still be around so I can buy another one. Actually, I should buy a backup now just in case.Anyway, a funny thing happened, I was using my old standard mouse left-handed because I didn't want to use it normally with my hurting right. I kept going back to that after trying all those useless vertical mice. During that time, I grew accustomed to mousing left-handed. I always did left-handed at times when I was writing or whatever, but with the wrist problem, I learned to do it all the time.Enter the Penguin. Windows 7 allows you to set up the buttons on external devices differently from the touch pad. So, on my touchpad, the left button is left click, as is normal, and I occasionally use that with my right hand to move the cursor when typing (I'm getting used to the touchpad since I've been using my little netbook more and more on the go these days with no external mouse). However, since I was used to using a normal mouse with my left hand, I became accustomed to my left middle finger pushing the left click button (I could have changed this around but I didn't, probably because I also use the terminals at work with my left hand and I don't have access to change the buttons around). So, these days, whenever I use a regular mouse, whether I use my right or left hand, the left click is set as the left button. My left middle finger is left click, or my right index finger is left click. My touchpad is normal too--left button left click. My Penguin, mouse however, I set up the opposite, so, the BOTTOM button I have set up for left click, that's my middle finger on either hand. With the Penguin was the first time I experienced my right middle finger being left click. I'm right-handed so that was not hard at all to learn. Took seconds to get used to it that way.And, another funny thing happened. When I got the Penguin I was already accustomed to using my left hand so that's how I use it. However, when I want to move it to the right, I just put it over there (no cords to worry about) and use it as is. The "bow tie" button switches the scroll wheel. And I didn't even notice that now, with the Penguin, my right MIDDLE finger is doing the left click. And, at work, when I grab a normal mouse, I still don't have any problem because I did it normally for a decade (though with my wrist I usually don't do that for too long).So, with all this I wanted to tell you that the human brain is amazing and YOU WILL GET USED TO THINGS. This mouse however, doesn't take much getting used to. Those vertical ones are horrible--hard to maneuver, don't keep your wrist straight, crappy quality, etc. The Penguin saved me. Thank you Penguin and thank you ErgoWareHouse for selling this to me....wait a minute? I'm the first reviewer of this? Seemed odd I'd buy something without any reviews. Hmm. I guess I was just desperate. Either way, this thing is great. I don't look at it and say, "I love it" or anything. It's just naturally there and I forget about it, like you do with a normal mouse. It works and I get my work done. I even had email communication with the seller before buying and they were attentive. Now, my mouse is no longer even anything that's on my mind. If you have someone else who uses your computer you can always have two mice set up at once. Hope this review helps anyone with wrist troubles.Oh, BTW, as you know, many people are stubborn. Right wrist problems and they forget they have a left hand. Use your left, silly! I'd highly recommend training with a regular mouse with your left hand at first to save your right wrist. Then, before you get carpel tunnel in your left wrist too, buy this mouse!

EDIT After contacting with Posturite UK.Well, after being contacted directly via email by a Posturite UK representative, he arranged a replacement sent to where I live today, and I didn't have to send the faulty one to them!, this was a very pleasant surprise given the cost of sending the faulty one to the UK or the USA would be greater than the value of the mouse itself. The replacement mouse arrived in a week, and it works like a charm. The representative said that he'd send one of the "latest batch", and it seems that some issues have been fixed. The scroll wheel is working now and I haven't had any random movements of the cursor until now.Because of this warranty and the nice treatment from the representative, I'm changing my rate to 5 stars now, this is the way a company makes and keeps new clients.**************************************First, as an ergonomic mouse it's great, the wrist rests fully while the whole arm has to move, the way it's meant to be. The pain has reduced dramatically.But... the opticals don't work on my work desktop. It's a completely white desk, and sometimes the cursor moves, sometimes it doesn't. I have to lift the whole mouse to a place where there's a (now permanent) coffee stain so the optics pick up something. I didn't have this problem with my previous mouse, a Microsoft 5000.This has lead to some frustration while working, and to BIG frustration while gaming.I've tried with some other surfaces, white paper, printed paper, cardboard, printed glossy paper, with mixed results.I don't want to get a mouse pad since the base of the mouse is so large, the pad would have to be quite large too, but i'll try on a few and edit.EDIT.This mouse sucks. The optics randomly work on any surface I've tried it on, now the pointer moves, now it doesn't. It's been very frustrating, even my coworkers make fun of me because of such an expensive mouse that doesn't work.I'm gonna get a refund.EDIT EDIT.Well, the mouse didn't suck as much, found the problem, I bought a USB 3.0 hub alongside the mouse, and made a last test before returning it, I disconnected the Hub and connected the mouse directly, and it worked like a charm. Made the test on another computer and it was definitively the USB Hub. Tried different hubs with mixed results, but ultimately had to return the hub. So, the mouse works, but not on every USB hub, and has a conflict with theSabrent 4 Port USB 3.0 Hub with 4A Power Adapter support Fast charging Function [VIA VL812 Chipset] (HB-J3U4). So, don't buy together, I got a $3 usb 2.0 hub an works like a charm.EDIT EDIT EDITHaving had this mouse for a few months now I can say that it's not a good mouse, it stops working randomly and often and I have to turn it off and on again to work, and sometimes I even have to disconnect it from the usb port for it to work. Also randomly the pointer moves either all the way to the top of the screen or some space to the right, not very often, but it happens. And the scroll wheel, from some time on it started not to work alright, while using it, the pages don't scroll as expected, but move up an down quickly not going anywhere.It's a shame that such an expensive mouse has such low quality in its electronics. It was a gift from my wife so I use it all day at the office, where I've become accustomed to its nuances, but when I get home and use my old standard mouse I can feel the difference.