I just purchased a V1. My Bel works just fine, I just feel the need to know where and how many radars with which I'm dealing. So far I really like the counter and arrows. It seems a little quick to switch from front to side radar. During an alert today when I saw the CHPer going the other way and the arrow switched when he was about my 10 o'clock. Not really an issue as our closure rate was over 150mph. He was also about 150' away, opposite direction. I got plenty of warning and the ramp up was better than the Bel. The arrows helped me identify the threat quickly.
Now for the really "I don't like"! In the dark you have to know the relative position of the indicated alert. The band indicator is a light next to a printed letter on the case; top to bottom L, Ka, K and X. From my limited use I don't detect a difference between the audio alerts, like my Bel. From the rave long term reviews I've read I assume I'll get used to this. My old Bel wiring will work, but the mute nor programming functions on the V1 do.
In summation if you want the best laser, multiple alert and direction arrow detector, get the V1. I feel I will acclimate to the darkness issue. If you need a detector that is radar detector detector immune, get the Bel as it is totally immune to such devices. I am totally satisfied with my STi Driver, I just wanted the arrows and best in class laser detection. BTW, the Driver saved me a laser ticket last December. It did a nice job of picking up "splash over" from targeting cars ahead. How do I know? Well, 80 in a 65 on the 101 would have definitely generated a ticket. I was down to ~72 when I saw him point the gun at me.