I had the opportunity to do a little testing tonight on some 34.7 Ka from the local sheriff's dept. One of the deputies left their unit on and was parked facing oncoming traffic right next to the street. My first run was with the V1 (Ka guard off, mounted high) and I was able to mark my distance in city blocks away from the source. I made 3 passes to make sure that I was going to get similar results, and they were almost identical. My next run was with the Redline, (V1 off) in hwy mode. My redline was almost 1/2 to 3/4 of a block later than my initial alert from my V1. I made several runs to verify my findings. There was no traffic so reflection was not an issue. I then made a couple of runs with the V1 with Ka guard on. I was pretty surprised that with this setup, the V1 and the Redline were almost identical in detection distance away from source. My final 2 runs were made with the V1 and Redline on together (Ka gaurd still on). I was wanting to see if the V1 would interfere with the Redline and cause a late alert. I had the V1 mounted on visor on left and the Redline on visor on passenger side. While driving about 20mph, the V1 beat out the Redline by a fraction of a second, but at the usual alert distance that the Redline had been going off. So at least on this test there was little or no interference between the two detectors. I know that this is not always the case, but I wanted to check anyway. I think that the new V1 3.891 is gonna kick some serious butt when it gets tested by the big boys. I just wish that it had some of the cool features that the Redline has, such as voice and spec mode.