Thank god there are some people in here defending radar detectors. Mine has saved my ass so many times it's not even funny. And All I have it a $100 (canadian) Whistler from Future Shop.
It's funny, idiots that ride with me (and i'm sorry but it's usually girls that do this) I'll drive by a cop and it won't go off and they'll be like "Haha, that thing doesn't work" ya well he didn't have his radar on dumbass.
As far as radar detectors detecting laser. Well here's the thing, they have the ability to detect it, but the odds of it doig so are soooo small. Radar spreads out EVERYWHERE, it's huge, when they use laser, it's about the sieze of a penny (to the best of my knowledge) and the odds of him aiming it right at your radar detector are small, and even then you are already caught.
In my experience, cops only use laser when there is an actual speed trap and they are not in the car. Usually in this case you are ****ed no matter what, only way out of these is if somebody flashes their lights at you.
Here is a few stories where my radar detector has paid for itself.
1) It was late, maybe 2-3 am, I was driving downtown and then started to head to the industrial area, I turned onto a road and was about to floor it and just haul ass down this road, but as soon as I turned onto it my radar detector went crazy, and those headlights at the end of the road turned out to be a cop.
2) Another time I was driving around town, doing, maybe 65 in a 50 and i was coming up to a bend in the road, my radar went off, I stabbed the brakes to 50, and a cop comes around the bend.
You can't just buy a radar detector and then go driving around like an idiot and not get caught. I don't depend on mine 100% and then just close my eyes and speed. It is a tool that HELPS, obviously I'm gonna watch out for cops. Another thing, people say by the time the radar hits you, it's too late, well for speeding, that depends on if you are alone or if there are other cars around. But lets say I'm with my friend in his mustang, doing the speed limit, and he decides he wants to get buck sideways around the next corner, but the radar goes off, now we're fine cause we aren't speeding, but now that we know there is a cop around, we aren't gonna drift that corner anymore now are we?