I've had these chairs for a little over 2 years now and they're terrible. Like other reviews have said, they don't 'age' well. They look pretty terrible once they're sat on. They go flat and they don't get their shape back. 
The biggest problem, is that the legs are don't stay screwed in. I've had 2 people (and myself) fall because the legs gave out. I contacted Wayfair and they sent me 2 (out of 4) new chairs and they do the exact same. They're a liability and I don't trust them. It's quite a shame that they're so poorly made. 
**Yes, the legs are screwed in correctly. I even had a professional check, and no one that's sat on those chairs are heavier than a normal person (around 120- 150 lbs).