The Acase is fine with at least some rear skins--I used one for months with decorative skins from DecalGirl. Only problem is that over time, the ice cube case does stain pretty badly, like most soft touch cases seem to. They're cheap enough to replace regularly though.
For reference though, that Acase does not add much to the dimensions of the phone, unlike Apple or third party bumpers. It's a very slim fit snap case, and I have at least one holster that didn't fit the bumper, while the Acase fits fine. The Acase also has no lip over the front--nothing to interfere with a screen protector, but also no lay on the table function.