Oh I fully expect bugs in such a new game especially. My only (personal) issue with Nutaku is somewhat overzealous labeling of "fraud" in billing that left me on the phone with my credit card for an hour. Beyond that all I can complain about is the general "why the hell do you guys make things so pricey?"
I really appreciate the gems though, when you do end up with server issues its good customer service to acknowledge it, but AMAZING customer service to try to give compensation as well.