Up to now i am very happy with my new z2, the only 2 small things i dont like is:
1. the placement of the usb port, i hate the fact that its on the top now as i often need to keep it plugged in while on games or the battery just goes.
2. the actual battery not being any better, in fact as a direct comparison to the my z1, for some strange reason i have it setup exactly the same, my z1 may lose about 1-2% over night not doing anything, but my z2 has been losing around 4-8% per night up to now.
James