I got my case a few hours ago and I love it. I'll jump in with the crowd and answer your questions, repeating what they said:
Screen protector is responsive, it has missed a few very light touches that I was used to registering but it's seriously not a problem.
I played NFS Shift and GTA 3 for about two hours in a row today and it felt warm, but that's normal.
I wouldn't worry about the heat at all: most modern CPUs will slow down as the temperature rises into danger zones, and if they get hot enough they will freeze and/or promptly shut down.
I do like that the phone is actually something to hold now, and it gives it a distinct look: I've had three people ask me today what phone I'm sporting.
Moto Droid RAZR MAXX w/ Otterbox Defender - The Arctic ICS ROM .215 leak