Wayfair have been brilliant customer service wise... but the product isn't great to be honest. 

1) Don't screw the screws too tight as they snap (Wayfair sent me 2 new stools kindly)
2) But if you don't screw them tight, the whole thing comes loose...

So you can't win. Although we love using them, they are too flimsy (and only been in use 3 weeks) so wouldn't recommend. Given 2 stars because of Wayfairs customer service.