I have a G2 on mine... The G2 in use is superb... The installation, however is the most expensive process I have ever gone through for such an inexpensive add on...
So they ship you Two or three screen protectors... They're a hard plastic and fit between the LCD and case. You're supposed to wedge them in there...
First one... Got finger prints all over it in installing it, removed it...
2nd one... Creased it in installing it and then SHATTERED my screen in removing it.
3rd one, after getting my Z refurbished went on with no creases, dust, hair, fingerprints... And took me nearly an hour to get like that... The first two I though I could install in 5 minutes...
I'll chalk it up to Jackassedness... Live and learn. Next time dismantle the Z, put the screen protector in and reassemble it.