Northern NJ, just got my X50 and I can confirm the following already known bands: X (state cops, large SUV vehicles), K (crown vic. marked local cops), Airborn VASCAR (not seen in use yet but the signs along with highway markings are clearly visible).
Also local redlight cameras are going up in certain towns. Some tied to those black rubber strips in the road perhaps for testing because I see them only on occasion.
Also on I-80 in morris county, unmarked black (04) impalas... hard to distinguish from other cars. (State police? They are usually getting out of the car and look pretty sharp not like local cops) Havent gotten a radar going past them yet so they might be using laser, instant on, or pacing so who knows.
91 Dark Blue Honda Accord EX, Blue X50 mounted center of windshield just above top of wipers, and with a clear view out the back just over my 3rd brake light. I keep it in "Pilot.H" and "Expert Meter" and dim appropriately to reduce visibility.
edit: Also, I've seen either POP-K (or Instant on K giving a false POP) on I-80 west. Nearly scared me half to death... "POP"!!! then a steady "K,".... then a few seconds later "POP" "K|".