This was one of the most difficult purchases I've made. I was convinced that buying a chair, sight unseen (not to mention un-sat in) was idiocy. I'm not of average body type. I'm short, heavy, have a slightly hollow back, and spend way too much time staring at my monitor or typing on my keyboard. Plus, my budget was limited.I struck gold quite by accident. I sit in this chair every single day and it's still the same as the day I put it together. The seat is still thick and cushy, nothing has broken or cracked or stopped functioning. Nothing has torn or collapsed. I hate to even think how many chairs I see destroyed every day where I work. I don't rock or try to balance on two legs but I do propel myself around quite a bit (good for building leg muscles is my pathetic argument). I occasionally flop in the chair a bit roughly. But overall, the chair sees good use by a sensible adult who claims to work alot remotely (and I'm sticking to that story). It's been worth every penny and then some.Great chair! Buy one! But if you're a guy who thinks you can do a daily gymnastic workout on this and feels righteous indignation when it eventually breaks.. find yourself some monkey bars and a set of realistic expectations before you post reviews. The rest of us average, responsible people thank you for not muddying the waters.