In short, the best cover available ...
+ Exactly processed (no sharp edges)
+ It is tight on the device, without the risk of slipping
+ Even after 4 weeks are no abrasions to see
+ The carbon look looks not cheap
+ All buttons and ports are available as usual (except infrared)
+ Also protects the display, or may be placed on the side of the display, as it survives.
- It's a bit too smooth. But it does not slip out of your hands faster than without :)