I have used many models of radar detector over the past 20 years and my
favorite for the last 14 or 15 has been the Valentine1 (and no I don't work
for them and neither does anyone in my family, etc.)
As to do they work...of course they work. What you may be referring to is
radar jammers. The vast majority of radar jammers out there are considered
"passive" jammers that purport to scramble the radar signal somehow and send
back a scrambled signal to the police radar gun. These DO NOT work...don't
waste your money. Defeating radar would require an "active" jammer and you
can find some of these, BUT, they are quite illegal.
There are also laser jammers that work well. Jammers that have an actual
laser tranducer (eg Lidatek) work very well, but the ones that reky on LED's
do not work as well, if at all in some cases. I can tell you that my
Lidatek system has saved me from getting tickets about 8 or 10 times since I
ourchased the system. It has more than paid for itself when you consider
the fine of the ticket + increased insurance fees that would have occured
with getting a ticket.
As far as the Valentine1, what their advertisement says is true. Once you
use the V1 and get used to the directional arrows, you won't want to use any
other detector. It shows you not only how many signals it's receiving, but
whether they are coming from in front, behind or to the side of you. This
info is invaluable in figuring out what's going on. As with any system, it
does require some thought on the driver's part to distinguish false from
real alerts. Things like door openers in grocery stores can give a strong
signal, but you will know how many signals the unit is receiving and also
what radar band they are. This has saved me. I know that on a certain road
I drive frequently, the openers at the grocery store give off 4 radar
signals in the X band. One day I'm driving and the detector goes off as
usual, with the arrows telling me the signal(s) is coming from up ahead.
But, I the "bogey" counter tells me that there are 5 signals this morning
AND the audio warning gives me indication that a Ka band signal is present.
Because this isn't usual for this spot, I slow down considerably and as I
drive past, I see a police car with radar hiding in the parking lot. He
knew that most detectors wouldn't let the driver know there was anything
there but the door openers.
I won't drive without one.