“I have both PlayProof and Crashguard and now the Mod. I think Mod is a great idea but with some drawback: the bottom is not so accurate, and doesn't close well if using a back in the cover mode (bumper mode with rim is ok). The keys moves and are not nice to watch at.
The best one in my opinion is still the Playproof. Mod is better than Crashguard btw”
