Particularly useful are the stand function with the tab on the back and the hand strap on the inside when you use the tablet upright example for reading. Thus, the tablet is even better grip and the hand.
A real appreciation with "wow factor" for me is the magnetic lock. The Tablet responding to open and close the cover with turning on and off, what a real comfort brings profit.
As a bonus there is a pen with rubber cap to. This allows the tablet properly operate. So for all have the often dry finger or generally can with their fingers are not aimed particularly well on the touch screen also has a good busboy. In addition, one can thus avoid unsightly fingerprints on the screen.
A tiny drawback is that the cover must remain open during charging due to design, but this is to get over. After some time, you should also take the tablet for cleaning from the shell, because unnoticed dust collects in the corners, but this is a common problem of such cases.
Conclusion after 6 months use:
Highly recommended for the Xperia Tablet Z and a real appreciation.