I don't know that it's the best anymore, but I've never gotten a ticket with the V1.
It's really annoying in the city (goes off all the time b/c of auto-door openers) but I heard there's a way to program that out.
On the freeway where it really counts, I get warnings for radar over a mile out (or further on straight roads). I like that it makes different sounds for different signals, so you never have to look at it, once you learn them.