I saw some copies of the new 5th edition in Kinokuniya in Shinjuku at the weekend. There were three in a pile and the top one's cover was all curled up. I picked it up to have a look (having heard all the problems on here) and the one underneath also had a curled cover. So did the third one. It did feel like a cheaper copy of my 4th edition, even the pages are thiner.
I had a quick look at all the other text books lying around it, and not one other book had a curled cover. I can't believe that Heisig is less popular than some of those other text books, so why is it so cheaply made??