This is just a semi-educated guess, but (and I think this applies to both edible image media and pre-printed edible clip-art):
If they're anything even remotely like the edible image media the local cake supply uses (presumably DecoPac, since they use DecoPac inks), they probably taste very bland (I actually tasted a bit of the waste area of my first edible image), and cut very easily. (Maybe too easily: my parents, wanting to preserve the speed limit sign on their anniversary cake for as long as possible, cut around it, and within a day or so, the foil covering over the cake had made contact with the image, stuck to it, and taken a divot out of it! Why I didn't use the pan with the fitted cover, or break down and buy a cake cover set . . . )
I'm guessing that's fairly typical, since you wouldn't want to have the flavor of the material fighting with the flavor of the frosting, or the structural integrity of it fighting you when you try to cut it.