I originally had a G1W, but "upgraded" to a Rexing V1. The V1 was twice the price as the G1W, but the quality was about the same.
I have it mounted to the windshield behind the rear-view mirror (you can't even really see it from the driver's seat). I used an "Add-a-Circuit" to piggy-back off of one of the fuses in the panel next to the driver's side door.
Here's my "How-To" thread on how I installed it:
DIY: How to Hardwire a Dash Cam or Radar Detector
Video clip from the Rexing V1:
Video clip from my old G1W: