It is transparent, so with a black Z2, it works well (with a white that still happen better).
It is semi rigid, and is easy to install on the device.
Of course it keeps very well, because to remove it is a little more "difficult".
The hull is well done, it leaves access to the headphone / free usb port, thankfully!
Volume buttons, power and control are easily operable. Besides I prefer the hull, because without, they are a little too sensitive and too stuck.
With the hull those worries fade.
Great product!