The seat is thinly padded so you feel the bolts in your backside while you sit - pretty uncomfortable. I have the chair as a present so I don’t care too much but I’d be pretty unhappy with it if I’d bought it for myself.
Like many others I bought this chair for teleworking. The instructions were clear and easy to understand with color-coded/numbered pictures. The only “problem” I had was getting the wheel into the slot. I had to rearrange a few and jam one in using a hammer but the others were pretty easy. Having had this chair for a couple of weeks I can still say it’s pretty comfortable and am happy with it. Of course it’s not good to sit in ANY chair for 12 hours a day so I just get up every hour (thanks Apple Watch) and stretch a bit just to keep my sanity.