I sit for long periods of time for work and this is the most comfortable office chair I've ever had. It beats the $350 TempurPedic chair I bought a few years ago.
I had an identical chair for probably 10 years and it was still serviceable but parts were starting to wear out. Ordered the identical chair recently It comes partially un-assembled. Pretty easy to put together. I suggest using the shipping box as a stand to assemble the chair.This is a comfortable chair. However I am amazed how much dust accumulated under the seat of that old chair that I had never seen prior to disassembling for disposal! So I suggest you flip the chair over every year or so to vacuum it!