Today my GameGripper arrived. I ordered the X-Box style.

The Good:

1) Construction seems sturdy. I don't think the buttons will easily come loose.
2) Hole for both the USB and Headphones are present meaning charging and listening via headset is possible.
3) Key presses seem responsive and the buttons hit the keys precisely so that no missfires are registered.

The Bad:

1) The side grips do not extend far enough in my opinion. The gripper holds the keypad but is easily slipped up and away from it - especially when playing a real button masher like Street Fighter.
An extra 3-5mm on either side would have meant the Gripper sides would have wrapped the keyboard more effectively and prevented this.
2) New Bad - the hole for the charger - not large enough to take either the standard N900 charger USB cable can be forced.. This is a semi major problem in my opinion. Lowering score until fixed.

All in all I give it 4.0 out of 5. It is great for on the go gaming and very portable.