I have the full game now, and installing it as we speak
I was doing the XP hack to allow Direct X 10 features, but this time didn't.
Even so, I seem to be getting at 1680x1050, more FPS with the full version.
I'm getting around 18-25fps now, which is definietly playable, all High
I don't know if its just me, but the textures look better on the full game too.