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i have both a v1 and an 8500 x50. i can not say enough about the arrows on the v1. i don't care about reducing false signals as much as seeing where a cop may be sitting or closing up behind me. v1 all the way.
I have a barely used x50 in the box with a hard wire kit, plus an extra car charger and windshield mount so you can move it easily from one car to another for $250.
I can't use it, they are illegal in VA, just moved here.