Got mine today. Impressions:
1) Fit is really good in terms of being tight. No sagging, and works fine with regular accessories.
2) Fit is OK over power button and mute switch, but it is NOT good over volume buttons, they do not quite line up and look a little crooked. I suspect they moved the mute switch but maybe not the volume buttons for the CDMA phone. Despite popular belief, these buttons DID move (about .5 mm) on the Verizon version of the iPhone 4.
3) The screen shield and rear protector are crap. I had always used PS stuff, until recently when I used the SGP Ultra-Optics. I didn't really like it, so I swapped it out for the Crystal one that came with the case. Very tough to apply correctly, and once stuck down, hard to reposition. I will give it an A+ for clarity though. The rear shield - forget it. Stuck down once, wanted to reposition, and it actually ripped trying to pull it back to reapply. I had to fish my old PS rear shield back out, wash/dry, and re-apply. Will definitely stick with PS from now on.
Overall, I give the product about 3/5. It is a sharp looking bumper that will tide me over until I can order the Deff Cleave in a week or 2.