I bought 6 of these chairs last year, but did not use them till the next time I had people over, which was more than 30 days from my purchase. They seemed fine when they were delivered; however, one of them broke as soon as a very normal sized person sat on it. I did not want a refund, just a replacement. It probably was defective to begin with, but not visibly. 
I like the chairs, but I'm not happy that I could not get something that quickly broke replaced. Live and learn. I can't even buy another single chair, as they come in sets of 2. My advice for anyone buying these chairs is to make sure they are not defective as soon as you get them, and don't wait for someone to sit on them at a dinner party.