I've been needing a new office chair for a long time, but only recently started looking. I sat in the mesh version of this chair as well as the Hyken and the Work Pro Quantum 9000 at Staples and Office Max. I think I'm an average size guy at 6 ft. 220 lbs (ok, maybe a bit heavier than average) and the Hyken and Quantumn chairs felt cramped and uncomfortable. The 1500TM felt really nice and was the correct size for me. Also, the end where the backs of your knees sit is much more rounded off on the 1500 than on the Hyken or the Quantum which also improved the comfort level (not putting pressure on the backs of my knees.)
The chair has a lot of adjustability and nice features, and it also appears to have fairly good reviews.