About a year and a half ago I bought a radar detector. I read some reviews and tests online where they set up a radar gun and drove the car at the radar guns (on the different radar bands) and noted down when each radar detector picked up the signal.
My BEL 980 actually outperformed the V1 on a couple bands and it cost $200 at the time. BEL has since come up with a newer model, so that one may be even better.
The only time I've gotten a ticket since I bought it was when I had gone to Canada the previous night and had thus taken out the radar detector, since in Canada they will confiscate it if they see it. Well I had forgotten to put the radar detector back in the car and wouldn't you know, the ONE time I don't have the radar detector the state troopers nailed my ass!
Radar detectors are good, but they will not make you invincible. For example, if you are the only guy driving along a road for miles, you can't really rely on your radar detector because the cops lying in wait for you will probably not even turn on their radar guns until they have you in their sights! Then again, if the cop is lazy he may just turn on the radar detector, point it at the road and kick back and wait for a speed demon to come by.
So where it's really useful is on the Interstate when there are plenty of other cars that the cops are shooting with their radar.
The other reason I haven't gotten many tickets is I'm also always focused on the road and if I see brake lights coming on up ahead as cars crest a hill or come to a bend or something, I know there are cops there. Things like that.
Also, one time I almost got nailed with the "Instant On" radar, when the cop doesn't turn the gun on until he has you in his sights, but lucky me, since I was alert I saw the cop and slowed down enough that by the time he got me, I was only doing 65-70. In that case, the radar detector didn't save me, it was my alertness.
And these people saying detectors don't do any good against laser, I disagree. My detector has saved me from laser a couple times, but when the laser warning goes off, you have to slow down RIGHT NOW and no pussyfooting around like you can do if it's a K-Band alert or something.
Supposing there's a car in front of you and the cop hits that car with the laser, then some of the laser will pass through the car's windshields and hit your detector. Luckily lasers are expensive so you don't see them too much.
That radar detector has been one of the best things I've ever bought. I paid $200 for it and it has probably saved me about $600-700 in traffic fines during the last year and a half. Talk about a return on investment! Now if only my stock portfolio was doing so well!
-Nick Viejo.