The arm height is not adjustable and for me the back is too far away/back from the seat - that distance is not adjustable either. The seat pad is pretty comfy and it's lightweight. If it wasn't such a pain to disassemble and repackage I'd probably return it.
This chair has so far been well worth the money spent to purchase. The chair was easy to assemble and much more comfortable than the office chairs I used working for my employer.