SIDIZT80 Premium Ergonomic Office Chair : Extreme Comfort Home Office Desk Chair, Adjustable Headrest, Lumbar Support, 3D Armrests, Forward Tilt, Seat Depth, Alternative Gaming Chair (Black)

I've been using Sidiz T80 for two months, and now I can share some of pros and cons I found.First when I got the chair, it felt really uncomfortable for a week. Then, I realized that it's because I wasn't seating correctly. I was seating more like "C" shape when it supposed to be like "S" shape. Then, I felt significantly less back pain after I correct my posture. I felt like T80 designed to be support your back really well seating with right posture.Second, it's very easy to assemble. It took me less than 5 minutes to unbox, and assemble the chair. Also, I really liked its ease of use. Adjusting tilt angles, firmness of the back support and height are very easy to adjust and it's intuitive.It also comes with better materials overall than T50. T80 is significantly heavier then T50. T50 had more plastic parts and flimsy parts. T80 has better mesh back, cushion fabric and other parts than T50.On the other hand, there are a few things that I wish T80 could do better. I wish T80 offered a free tilt adjustment, instead of only four tilt pre-adjusted angles. I wish I could lock at any tilt angle I want. Also, I wish the T80's lumbar support can adjust the depth, like T50. It could've made T80 a perfect chair for me if I could adjust the lumbar support a bit forward (T50 offers it, but poorly).Also, I liked T50's seat cushion over T80. I'm not sure if it's just my T80, but the cushion is too thin and too firm. So I feel uncomfortable when seating over a longer period of time, which I didn't experience with T50.Overall, I would recommend T80 for home/office environment. ("maybe" for gaming)Pros- Well made, premium feel like office chair.- back and lumbar support is firm and it supports your back really well.- Easy to assemble- Ease of use.Cons- Price. Although this chair feels like premium, it's questionable when T50 is only half of its price.- Offers tilt adjustment, but only four pre-adjusted tilt angles.- Cushion is too firm and flat.

Update 07/27/2023:Lasting Quality---More than a year on and this is just as comfortable as it was when I received it. I decided to add a memory foam seat pad which I think has helped to improve my posture. For others unsure of what all of the knobs do, the LH side knob adjusts the reclining lock and the RH side knob adjusts the reclining resistance. My only gripe after spending some time in this chair is the hard plastic lumbar support. I will add a lumbar pillow instead.---Original review below---I have not had a very nice chair since I worked in an office, but because I now work from home and spend ~60% of my day in my office chair, I decided to upgrade from my cheap and very worn chair that had no adjustments besides height.I find it very difficult to justify the cost of some things like mattresses and chairs, but since I spend so much time in them anyways and I'm approaching 30, I knew I needed to start taking better care of my back and joints. As much as I would love to splurge on a $1500+ chair, this Sidiz T80 came in at half the cost of competing chairs, and I think this is easily as comfortable as any one of those competing brand's chairs I have had the pleasure of sitting in.It took me maybe 10 minutes to assemble including removing the wrapping from the box. The thing I struggled the most with was inserting the casters into the base, but once that was done, the rest was a breeze.There are a ton of adjustments, though I am not sure what the little knob stems on the side do yet. I know one controls whether and how far you can lean the chair back, but I'm not sure of the other.Only time will tell if this chair holds up, but first impressions tell me that this thing is solidly built.Side note: The casters are extremely quiet. So quiet that I can't tell if they're making any noise unless I'm really speeding across the office. Awesome!