I just received my navy/blue Casemate bumper yesterday. Some aspects I like, some I don't. It is a better fit than the clear bumper that comes with the XPE, but that also means that it takes a little bit of effort to get it on and off (which doesn't matter if you plan to leave it on all the time). The bumper is quite thin, and the navy plastic is hard and smooth. The blue trim is a bit softer, but there is so little of it that doesn't add that much to the overall grip or to any protective qualities of the bumper. I don't think the Casemate would offer any more protection from a drop than the included clear bumper.
The Casemate has rounder edges and that feels a bit better in the hand than the clear bumper. Both of them are similar in providing a somewhat more secure grip on the phone. The buttons work well IMO. The power button has little ridges, just like the phone's power button does, so you can tell it by feel. The navy plastic is a good match for the navy back of my phone. The light blue trim against the white face of my phone gives a bit of a toy look. I can see where others might like the Casemate just fine, but I find it a bit overpriced, not much better than the original clear bumper, and a bit worse in the sense that it covers up my champagne trim. The phone looks better with the clear bumper, or naked, IMO.
So I think I'm going to return the Casemate. If anyone wants to buy a blue Casemate, though, PM me in the next day or two.