Instruct: Classify a review as either positive or negative.
Query: As good as they say it is.

I've used this on the dashboards of 3 different cars, including the curvy one in my 240Z. It has never slipped or slid, even when driving on Devils Tail, or under hard braking. It is also easy to hide. I just pick it up and slip it down to the floor in front of the drivers seat before getting out of the car. Flop it back onto the dash when you start up. Move it from car to car just as easily.