[Lacrosse]

I've used invisible shield for the body of TP1, TP2, and zune hd, and they all work really well for the body. I will agree with that the screen protectors though are a little more grippy compared to the other ones which i've used for the screen, namely martin fields and clairvue anti-glare, both of which glide much more smoothly than invisible shield.

As for the screen being glass, i recall reading somewhere here that the screen is glass, as needed for a capacitive screen, but also coated with plastic to make the touch smoother and easier to work with. With that in mind, i will still put something on the screen, because the first week i had my zunehd, which has corning gorilla glass, i managed to scratch the screen with the device in my pocket, and only the device. Its still a mystery to this day how it managed to get scratched but i'm just gonna play it safe and believe that nothing is really scratch-proof, unless it was coated with diamonds.

Screen protectors aren't usually thick enough to inhibit capacitive screen performance, if they were, those companies would lose alot of money because their products won't work with iphones.