The Verge says it could be the best iOS game controller yet, although that might not be saying much:
The $99 Junglecat, which comes in black or white, looks to the unsuspecting eye like any other plastic iPhone case. It just about doubles the thickness of the iPhone, though it’s not terribly heavy. But the bottom half of the case slides out to reveal a four-way d-pad, ABXY buttons, and two bumpers for your index fingers — suddenly your iPhone looks a bit like a Nintendo 3DS or the Sony Xperia Play.
At $99 it’s still a niche product but this is my favorite design so far because it’s the easiest to have with you all the time.