Just received the Diztronic as well as the Incipio Feather Snap case. The Diztronic is well made and fits like a glove. However, out of the two, I have to pick the feather Snap case. It's just like the casemate barely there case for the HTC EVO 4G (not the galaxy s2), very thin, and feels like nothing is there. The corners are just barely covered. I was a little worried but I accidentally dropped it on the first day, and the corner of the case got a little scuffed up, but it buffed out easily with just my fingernail.
The Diztronic is nice, but it is definitely thicker than the epic 4g touch (galaxy s2) diztronic case. So it definitely adds more (not a lot of) weight and thickness. I loved the GS2 case and that phone's vehicle dock was a dock that you needed to remove the case from the phone for, so the diztronic was better than the case mate. The vehicle dock for the razr MAXX HD fits the phone in the case, so for me the feather is the real winner. Thinner, and lighter (I compared the two with and without the phone). But the diztronic definitely has more protection.
For day to day, I'm using the incipio. When I take it to the golf course or hiking, I'll put it in the diztronic.