the escort passport 8500. its the only way to go. its about $300 but worth every penny. its saved my ass on many law breaking occasions. please don't puss out and buy some whistler or cobra crap. buy this once and your set. www.radartest.com will tell you everything you need to know and help you make a choice.
I have heard very good things about the Valentine 1 as well, people say it's very comparable to the Passport 8500 (some say it's better).
I have a Uniden something-or-other and it sucks. Doesn't work 1/2 the time. My roommate needed money and gave it to me (like new) for $20, so I can't complain though. It's not very useful, just another gadget to play with. I found the best way to not get pulled over for speeding is to just not speed much. I usually drive around 63 mph and haven't been stopped since the days when I used to do 70+ everywhere.
they do help that is for sure....but you can't put all your money on them....sometimes they don't go off til after you've already seen them yourself. oh and don't forget to turn it on....i got a ticket once that probably wouoldn't have happened but i forgot to turn my radar det. on
I have the Valentine 1 it works great..usually..however..most p.d.'s and highway patrols use an auto on/off detector..basically the "radar" part stay off and just senses the car then turns on..and by then it's often to late and most detectors wont pick up on the sensor part..what you need is a jammer