I've had two: Some cheap Cobra one (in the $80 range) and the V1. The Cobra one, which, if I recall correctly, was purchased at Circuit City or Best Buy or some place like that. Yes, it worked, but it didn't tell me far enough in advance. It told me, like, just as I would be rounding a corner that there was a cop looking right at me.
The Valentine, on the other hand, is absolutely stellar. I haven't hard-wired it into my RS because I knew I wouldn't be keeping that car for very long. The V1 works like a charm. I would say to save up the $500 and bite the bullet. It's definitely worth it.
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