I haven't picked him up yet, but from what I heard/read there has been some problems with the paint on his doors, apparently also in the Henkei release too.
Apparently the paint on his doors can be sticky to touch and might come off. Some think it is due to the way they have made the doors. I'm not sure how common it is, but some of Takara's Prowls have also had similar problems, although it has been as common as Hasbro.