The differences with his elder brother are:
+ Bcp a more flexible and easy to use roulette
+ Blue lighting, rather fun (which can be off)
+ The small joystick that connects to the end in the cross (personally I removed it, being accustomed to playing without)
+ More sensitive and responsive directional pad
+ Both buttons accessible with the thumb are more sensitive
+ Config the software changed a bit in his presentation (futuristic)
+ Rubber pads are bigger and therefore better cling to the table
- Noisy keyboard keys, and less ergonomic (for my taste,) the face of the keys is almost flat while the n52, it was curved and "married" the best form of finger
- Small bug (after saving a profile) at the config diagonal of the cross which walkthrough is on the Belkin website (unassign the diagonal displacement buttons than it running again)
More than + - so I recommend the purchase if you want to change your old n52 or put you there :)