The screen is a capacitive touch screen...which last time I checked did not mean "heat sensitive". Iphones have the same type of screen, and nobody has really complained about having a screen protector affect it that much.

Does the invisible shield work with the touchstone chasrging device, since the device requires a new back for the pre?

Not heat-sensitive, and my Pre has a Bodyguardz on the front and the sensitivity of the screen hasn't been affected at all. To be honest, the cover creates less traction so swipes are smoother than without a cover.

So I bought an IS from zagg online. Applied it after reading the instructions and watching the video. Did all the little things like remove the battery and leave off for 24 hours (which was painful).  But my application looked awful. I later heard that a local mall in the Tampa area has an IS kiosk where they sell and install the IS's. I took my Pre to the kiosk and asked the rep if my installation was correct. I assumed before getting there that I did it incorrectly and that I would just have to buy another one. But I forgot about the lifetime warranty! The rep replaced my IS with a brand new one and installed it correctly in a matter of minutes. It looks WAY better. I only had to pay the $10 install fee but it was completely worth it.

Apparently, I over-squeegied the IS when I applied it. This caused the glue to move around and make additional bubbles. The rep did one stroke in each direction with the squeegie while I did multiple trying to get out every bubble and bump. This only made things worse.

I only applied IS to the screen-side of Pre (not the back).  It does not interfere with the screen or sliding keyboard. In fact, as a previous poster mentioned, I like the responsiveness with the IS on.