I have the k40. it tells you from which direction you are being hit with and which band. for instance, it will scamble the ka band (laser) and is very sensitive with x band and k bands so driving though the city is apain but you can always mute it and go by the indicator lights which is fine. i havent gotten a speeding ticket since, but i got a few obstruction of traffic fines which leads me to beleive he had not been able to lock on me with the laser.
i like it. i dont 100% rely on it because sometimes it picks up apu scanning groceries, but other than that it is good. i give it a 90 out of 100.
It also lets you know when a helicopter is hitting u from the top as well.
All this talk on a sunny day, im goin for a cruise
Duke