I just tried auto-nox mode on Redline yesterday. Seems to filter K band pretty well. I was going to work this morning and went past the usual K-band speed sign, which was filtered, then it suddenly went to full alert on K-band, and stayed there. I was thinking, "damn, what is wrong with this thing?". Then I saw the parked cop 200 feet away.
Seems to work great - will leave it that way for a week.
I assume that Ka is still at full sensitivity on ANX (?)