I am using the maxnomic fort office work for 6 months now, cause the office chair I got from the company didn't really offer any comfort.
Build quality and comfort are excelent, I'm a tall person, and it fits me nicely. I love the 'lean back' option, which also tilts the bottom of the chair, the sturdy feel and the quality look of it.
It might be a bit overpriced for flashiness, but I don't think you'll get similar build quality and features for much cheaper. The 'ergonomic' chair my office supplied were in the '100 dollar less' range, and I wouldn't want to switch back...
Especially for something I spend 1/3 of my day sitting in, I don't mind paying a bit more to be comfortable.