We had one come out of the package broken (Abra) but it was the pin so it was not visible. We had a Mudkip break too the first time that we used it. I feel that it has a very weak point where the tail meets the body. I really think that it was probably cracked or damaged in the packaging but finally fell off when we tried to use it the first time.
Customer service has offered to replace the one about which I contacted them but now my dilemma is how to ship it back. It's probably going to cost me the $4 to package it and take the time to go to the post office, etc.
My husband is concerned that gluing them to fix them will alter the weight/balance and therefore spinning which probably doesn't matter when my kids play each other but could definitely be a problem if we ever do get to have tournaments, etc.