I've had one for a couple of years. No tickets yet. A few things to remember.
Always drive in or behind a pack ( of other cars).
When the first car gets shot ( with the instant on) you'll have a few seconds to reduce speed.
There are very, very few false beeps( on the highways) so whenever you hear one slow down the next few miles.
The arrows would be nice, but I like the long distances my 8500 sees ahead and around me.
If I'm by myself ( on the highway) and no other cars are in front of me, I don't speed.
I love my 8500 though. It was worth every penny.