I hard wired in my Valentine One Radar Detector on Saturday. I loosely followed the instructions on http://www.imagestation.com/album/?id=4292462839 except I placed the hardwire module in the ceiliing and just ran a 2' phone wire down along the windshield. I also ran the ground wire into map light housing and placed the "Y" directly under the screw against the ground plate. I didn't think the frame would be a reliable enough connection. I put a little foam around the hardwire unit to prevent it from rattling between the roof and the ceiling.
It looks incredibly clean and thanks to the great photos on the site, it only took me about 15 minutes, start to finish. Only about 4" of wire is exposed with the rest tucked away just in case the detector gets knocked loose. I just met a guy with a WRX wagon near me and he did exactly the same thing. He has the remote display unit and said running the wire was close on length. I'd same put the hardwire module on the left, to get it close to the instrument cluster. Then you can put it where the guy on the imagestation site put his.