This is the one thing I dont understand about cases.
Any hard case, whether rubberized or not, will scratch your device. I cannot stress this enough, but yet manufacturers still sell these types of cases. Why they do, I will never know.
What happens is that dust/dirt, gets trapped between the hard case and the device, then it goes to town and scratches up your device like sandpaper.
I would personally never buy any case unless the entire interior was lined with something soft, or if it was silicone. What I plan to do is, use a type of full body invisible shield, then buy whatever case that fits over top of that.
Seidio almost got it right by lining it with felt, the bad part is that its only the back, and not the entire device.