Valentine 1 is THE BEST, bar none. Friend of mine has one, we used it on a trip from DFW to South Padre Island to go party at spring break. We took his Ram and did a consistent 90-110 mph the whole way, passed about 20 or more cops, but it worked so well, we knew so far in advance of their presence, and which direction to look for them, that we made it there and back with no problems, even running at those speeds. That little run convinced me V1 is the best I've ever seen or used.
I had an older Bel, back in the late 90's, and it worked half ass, until I loaned it to a friend's brother, and the bastard dropped it twice in the parking lot on the concrete. After that it never worked right again. Hell, had a cop pull me over on the service road and it never went off, finally started going off about the time the cop got out of his car and was about to my driver door. He asked me how much that thing costed, I said too much, as I pulled it off the mount, and chucked it through the beer window into the truck bed.