Had for less than a year, the round bottom tubing inside the round bottom came apart and I had to grab my desk not to fall.   I was hurt rear ended and ended up a walking quad on and off full quad for years in un human 24/7 PAINS and that's the very tip of the iceberg, thought this chair would help with the things I still live with from all that, if I went down I might have re injured my neck since its not strong anymore, and to top it all off my golden retriever was under chair and could have been killed.   Chair is to big to return I cant even get it in the trash without help,GOOD LUCK if you purchase one.