Car: 2006 Mazda 6s w/Bose
Phone: HTC 8x w/ Otterbox Commuter Case
This is much better than the "InfiniApps Slyde" that I tried previously. Construction seems much better and it actually fits the cd player in my car. I knocked off a star here because it seems like it could hold a bit tigher when I actually pull on it (you can pull it right out with little force), but it hasn't fell while holding the phone or putting the phone on it so take that as you will. The opening on my deck is a bit wider and it is smooth for a ways going in (actual player seems a bit more recessed) so this could be the cause of that.
I slipped the larger metal piece between the hard outer plastic and inner gel and it grips the phone great. It doesn't move around or fall off.