I've covered about 25,000 miles with my V1 3.872 and have seen exactly one non-legitimate Ka alert and zero J-outs.
Ka guard is on.
It really varies. I get about 2-5 of them a month.
I only had 2 in a year that I've had my 3.864. Both on the highway, one was a rear alert then J'd out and the other was from the opposite lane on an extremely curvy road.
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