I'm 5' 8". The chair fits me perfectly. the lumbar adjustment is a nice feature. Even though it doesn't move much I am able to position it properly. I really like that the back is variably adjustable to position it. Sometimes I want the back more relaxed and this feature gets me there.
I just bought the chair. I love it so far. Very easy to assemble by myself. The left arm rest on the chair is having some issues and the chair is pretty tall. I'm 5'11 and sitting down by feet barely lay flat on the ground at the lowest position.
The chair is very comfortable! It adjusts easily and fits very well with my desk height. The mesh seat has some 'give to it' which makes for a more comfortable seating surface. I'm pleased with my new chair. The new chair smell was a bit overwhelming at first but some Febreze and time have made things better.