My local Applestore in the Bullring had the cases in both black and frosted for the MBP. I picked up the frosted one today.
First thoughts: It's thicker than my Speck. The incase logo on the lid spoils the clean lines. It is a much snugger fit. I got the bottom to clip onto my MBP no problem, unlike the Speck. The lid is another story. Doesn't fit and removing it is no simple procedure. I probably need a spudger to ease it off the corners.
Build quality is only a little better than the Speck, despite the rave reviews. On the bottom cover next to the rubber foot on the front left side there was rather a sharp bit of burr where the clip moulding tailed off. This would definitely scratch the soft aluminium of the MBP. A bit of judicious filing averted that danger.
As others have stated, the thickness of the moulding prevents the screen from tilting back much more than 90 degrees. A lot less than even the Speck allowed. This may be a deal breaker for some.
I hope that grit and other detritus does not get under the shell because it really looks like a devil to remove once snapped on.