Best review on the net:
http://www.laserveil.com/en/ultimate-radar-detector-review-05/introduction/But it will make your decision hard

I ended up getting my 8500 X50 off ebay, $250 shipped, love it

The Passport and Beltronics were a toss up, and I didn't wanna pay $400 just to have a RD with arrows, even though the Valentine 1 is very nice/