FYI: I just received the ZAGG Perimeter bumper case for my iPhone 5 today.
This product seems like it's just something ZAGG developed quickly to push out to catch the iPhone 5 wave etc. Specifically, the volume buttons are small and poorly designed, providing poor tactile feedback; user experience is lousy etc. Disappointing and I will be returning it immediately. The rest of it is OK and seems to cover the edges well.