What is the lowest height the seat will drop to?

The seat has some curves but eyeing it the best I can, looking at the front of it and measuring to the indentations for where your legs will sit is about 18-1/2 inches at its lowest point. At the sides where it is curved up is right about 19-1/4 inches but you sit lower than that. The center of it where you sit measures a tad lower than my first 18-1/2" measurement. Individual weight and leg length may factor in a bit. Sitting in it and measuring the best I was able from floor to the underside of my legs came up more like 17-1/2 to18 inches. Hope this helps.

Has anyone had this chair a long time, with heavy use? How does the seat cushion hold up? Did it flatten?

Have had mine for close to 10 years. Maybe longer - it's been a fixture in the home office for a long time. Best office chair ever made. Period. Brilliant if you have lower back pain, sciatica, etc. Seat used 10 hours a day, 5 days a week for 10-ish years. Good as new. Hydraulic lift, good as new. The rubber on the arms wore out but easy replacement on Amazon for $20. Eventually the back cracked from leaning back too much. Even then still holds up better than most new chairs and I refuse to replace it with anything but another just like it. I'd rather stand than sit on anything else.

Can I tilt this chair forward?

I'm not certain to what extent you mean tilt forward. Nothing drastic I would say. I do have a little trouble with my sciatic nerve at times and you can adjust the nob underneath the chair (in front of stem) to tilt back to the extent you desire. I do not desire to tilt back and prefer to sit straight. For the sake of the back of my legs we tightened that nob up even more and there is a slight tilt forward of the seat so it takes the pressure off my legs. If I look at the seat at eye level, I am unable to detect it but I can feel the difference. If I purposely lean back, or tilt, the back of the chair only gives a slight amount, maybe an inch. I will add that something I haven't been crazy about the chair is that the stem of the chair (between seat and base with rollers) will make a popping noise when I move on it at times. There seems to be just a little room for movement in there. With normal daytime noise you might not notice it that much. The mesh at the curve/lumbar section of my lower back has also given or stretched just a little and I would have preferred that not be the case. On the other hand, that probably helps it fit each individual a little better and it hasn't given drastically by any means. I don't use the chair the entire day long either though. Hope this helps.

Brand	Tempur-Pedic
Color	Black
Product Dimensions	26.8"D x 26.8"W x 40"H
Size	26.8D x 26.8W x 40.2H in
Back Style	Mesh Back
Special Feature	Tempur Pedic Seat
Product Care Instructions	Wipe Clean
Unit Count	1.0 Count
Recommended Uses For Product	Office
Maximum Weight Recommendation	275 Pounds
Style	Mid_back
Pattern	Solid
Finish Type	Black
Room Type	Office, Classroom, Library, Study Room
Age Range (Description)	Adult
Included Components	Office chair
Theme	Seating, Office Chair, Home office
Shape	Rectangular
Model Name	Tempur Pedic
Arm Style	Adjustable arms
Cartoon Character	Tempur Pedic
Surface Recommendation	Indoor
Furniture base movement	Glide
Indoor/Outdoor Usage	Indoor
Furniture Finish	Black
Seat Depth	24.8 inches
Fill Material	Memory Foam
Leg Style	5 Star Base
Reclining Position Count	Infinite Position
Tilting	Yes
Is Customizable	Yes
Is Electric	No
Is Foldable	No
Number of Height Positions	5
Chair Backrest Width	21.7 Inches
UPC	669245994286
Form Factor	Metal
Manufacturer	Raynor Group The
Item Weight	48 pounds
Item model number	TP9000-BLK
Is Discontinued By Manufacturer	No
Weight	48 Pounds

TP9000 Mesh Swivel Task Chair, Black

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