It might be nice if it could allow docking while cased (which I highly doubt because adding even a millimeter of thickness can screw up certain docks)
Other than that, it just looks a little bit too busy for how clean and smooth the iPhone is. The added curvature on the nice simple front of the phone is gone and replaced by some snapping/removable piece of plastic to protect the screen. It would annoy the crap outta me to have to remove a plastic screen cover every time I used my phone. I would feel like some 13 year old with a play-toy... To me I guess it's a nice design, just not for the iPhone....
Call me a purist... but that is just my opinion