I drive a Toyota Tacoma 4x4, and have recently started mounting my V1 on my visor. I flip it down a little to make it level. I really like the way that it is up high and also out of the way. Its actually pretty stealth (not that I need it to be since I don't live in Virginia or Canada).
I'm primarily concerned about radar reception because laser isn't used in my area.
I haven't had enough encounters yet to determine if this affects range from the front. Range from the back seems the same as mounting it under my rear view mirror. I have a slight tint band along the top of my windshield, and although this may affect laser I don't think it will affect radar reception. I also wonder if my rear view mirror blocks some of the front reception over what would be the right-front quarter panel area. Also curious about what implications exist with the detector sitting 3-6 inches or so back from the windshield glass. Thus the detector is tucked back under a little bit of my interior roof.
Anyways - this turned into a long post - in summary I'm asking for others' experience with visor mounting. If VR didn't advise a visor mount they wouldn't include one, so I guess it can't be that bad or might not be bad at all?