No problems with the core books, but I've had binding problems (the glue peeling away) on three other books: Adventurer's Vault and 2 Martial Powers (one for myself, the other I bought as a gift). And that's not from use -- all three came that way. I'm trying to deal with WoTC customer service to get them replaced. They said they would, but I have to send them all to WoTC, then wait for them to look them over (to make sure it was a printing defect), and then have replacement copies back to me. Which means I won't have them at the table and to design adventures. Definitely frustrating. I'm shocked that the quality control is so poor. I would understand if this happened with just one book, but three? That's a systemic problem. I hope they get the problem fixed -- I'm hoping to get Manual of the Planes and the Draconomicon for Christmas and I'd be very disappointed if they had the same binding problems....