I have a set of VZ Frags on my Compact and like them. They offer a better grip than the slippery stock plastic and are noticeably thinner.
The idea of aluminum grips doesn't set right with me, as the idea of cool metal touching my side while carrying isn't appealing, and western WA can be wet, so aluminum and water makes me think slippery. I realize the aluminum grips have grip tape, but haven't been able to try them yet. They do make the VZs seem reasonably priced.