V1, but like everyone says you need to use common sense when driving.

 

I just had the chance to compare a 8500 X50 blue and their Redline for 30 days. The Redline had a little better range. 1-4 seconds ahead of the 8500. Why I didn't get V1? Well they took my 8500 X50 in as a trade. Arrows are great but if I see KA band, I should slow down no matter where the signal is coming from. I love their auto mute and auto brightness display but have my sights on a V1 comparison with the Redline in the near future. ;D

 

I have used the V1 for years, I have one in each car... I figure if I have it in the car I better use it... my luck the first time I forget I will get zapped. I tried the latest version of the other brands and they seem to always be beeping around town even after all the talk that they do not beep at false signals. The V1 has tremendous range both forward and backward. Even works when in the glovebox!