I bought the Cobra iRadar that works with my iPhone via bluetooth.
Wife had my cordless Escort, and I had to pick up the kiddies from Grandmas. Picked it up from Best Buy for $140 so I was game to see how well it worked.
I'm still playing with it, but used it from Ohio to West Virginia and back and it worked brilliantly. I had to turn it off in Virginia (laws). The coolest thing was being able to look at the map (iPhone) and see where speed traps and red light cameras were and where other users had detected live police locations. When you see trap, you hit a button on iPhone and it let's other users know. It warned me of cops hidden in at least four places where I would have been probably busted. So I'm letting the wife keep the Escort.
Oh, just for the record...the speed limiter (155mph) that the Dinan upgrade removes? It's REALLY does remove it. Trust me on that one!!
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550i GT Black Sapphire Metallic w/ Ivory White and Black Nappa Leather, Cold Weather Package, Sport Package, Black Foose Legend Staggered 20s, DVDinMotion software, H&R Lowering Springs, Black Kidney Grill swap, and the Dinan Stage 2 Performance Software: 501 HP @ 5000 RPM / 580 FT-LBS @ 3500 RPM (w/ Cobra iRadar)