Update 11/6/20Just received the third one of these we have bought, and still using the two previous ones. Remain very impressed with the quality and ease of assembly and how well packaged they are. I highly recommend this model (5701).This is the chair to have if you are a larger/bigger person. The seat is ample for larger people and the height range is good for those with longer legs. The chair is sturdily built and provides good back support. The seat is 19" wide x 20" deep, and the back is 18" wide x 16" high. Padding is very comfortable. Assembly was very easy using the included tools, and all parts were well wrapped and packed. The instructions are easy to follow.The black material is nice, and easy to keep clean. The raising/lowering mechanism is smooth and works well. The wheels roll very smoothly. Even though the base is plastic, it's very substantial and looks like it will be quite durable.We have had many office/computer chairs over the years, and this is by far the best one yet, and at a very reasonable price. Shop around, you can get it at the lower end of the price range with free shipping.---Update 8 months later: The chair is still holding up very well after very heavy use, nothing loose or wobbly, material is still good and strong, wheels are fine, raise/lower function still like new.....And after a Year and 8 months of daily use on a hardwood floor, one of the casters broke. Luckily, I had an extra one on hand that fit that I had salvaged off an older chair. The casters could be a little beefier.