Update: Sept 2018:: I contacted Wayfair about getting replacement parts. Instead of sending replacement parts, they sent a whole new chair! That was above and beyond excellent customer service! Very happy camper.

Well, I bought it in January and it lasted until September. The flange connecting the seat bottom to the pneumatic post broke and now the seat wobbles all over the place.
It wasn't an expensive chair at all, but it only lasted nine months in normal day-to-day use. I'm going to contact customer service to see if I can get a replacement part, but I'm not too hopeful. Caveat emptor!