Just received my xtremeguard.. ($3.97 shipped to Canada)
Best money spent ever, infact I think I'll order a second one for backup.
I put the body protector on and adds a bit of grip to the phone and will protect it from scratches if I'm dumb enough to set it down on a bad surface.
I'm keep the screen protector as a backup since I paid $25 the day after release for a ghost armor matte anti glare protector which is amazing (but overpriced).
I recommend the xtremeguard bodyskin to anyone, I'll post back after I've gave it ample time to set and I try it with the HTC hard shell case.