All right, I got the one I ordered.
The material is a sort of vinyl...easily removable and repositionable, but seems like it would stay on all right. The rear application, which is what I was interested in, looks very nice. However, the front application, which I only put on to test, has two big problems: first, the menu key lights are not visible through the skin (even after a few months of use, I couldn't accurately hit the buttons without visual feedback) and second, the proximity sensor on the left is completely covered. There are holes cut for the led notification light and light sensor on the right, but not the proximity sensor on the other side. This caused the proximity detection during calls to not work at all in the tests I did (screen stayed on, even when the sensor area was covered or it was near my face.)
I'll update with pics if anyone is interested (I only have pics of the back and the unapplied decals, as the droid is my only functional camera), and I'll probably email the company to give them a heads up...