So I bought a used 3.812 V1 from Knighthawk today. It is out of tune on X and K but Ka seems to be unaffected (if so not by much). So far I am very impressed with the Ka band sensitivity.
The few Ka encounters I have had seem to be slightly more impressive than the ix in terms of detection although I haven't compared these units head to head (I won't run them together). When I tested this unit with my TV remote for laser sensitivity it was very easy to get it to alert to laser. Today I had over a 1 mile Ka hit over 2 hills in moderate traffic. Arrows are awesome! Being able to ID a source is a great! I'll be sending it in for a tune up to get X and K sensitivity back up to par. So far I am very pleased with what I have seen with this unit. I'll be posting my thoughts over the next few weeks in this thread.