I recently had a great experience with WOTC product support. The binding on my 5e Players Handbook started to go - a whole section at the front of the book had separated from the binding at the bottom and started to split up towards the top of the book; a small section of pages came out. I found return instructions on their website, and shipped it back the week before Thanksgiving. Two weeks later, I got a brand new copy, AND an unexpected copy of Rise of Tiamat! I was really surprised they got it back to me so fast - 2 weeks turnaround with a holiday in the middle is just about as fast as you could reasonably expect and including a copy of their latest adventure book was a huge gift.As an aside - we've been having so much fun playing 5th ed, I went and bought another copy of the PHB so we wouldn't have to go without one while the original one was being replaced. I was expecting it to take much longer but frankly I had been wanting a second copy for the table anyway, so I'm not complaining 
