I have a Valentine and only use it on long trips in my truck. It seemed to work great the first couple of times I used it, but lately it seems that there are so many electronic devices out there, that it will just sound off the entire way on the interstates. Pretty worthless if you ask me. In my neck of the woods (118 frwy) the CHP has gone crazy with writing tickets. I can drive down the main boulevard a couple of miles from me (Tapo Cyn) and without exception someone has been pulled off the frwy getting a ticket. I'm talking 24hrs a day. It's pretty much a joke between my wife and myself. The area was previously rarely enforced, now the CHP is trying to pay the States defecits off with tickets.