Don't have much experience with radar scanners, but I am in the market (money willing) for one.
My boss let me use his Escort when I was doing some mountain runs around here a while back. I was very impressed, thing picked up everything. Saved my ass a few times. Shitty deal is on the way back from getting coffee I went to have a smoke, had forgot my lighter, so unplugged the scanner to use the car's lighter. Sure as fuck radar trap gets me. 150$ for doing 84km/h in a 50. Lamez... Oh and cop didnt say shit about it hanging there when he was talking to me about my recklessness.
Once I've done more research I'll post up my findings on here.
Best of luck with your enthusiastic driving.