I recently tested my roll over sensor on my 09 570 several times during a race, and the bike would run for a few seconds laid over and then turn off. Don't mean to contradict you Suhoi27, just my observation.
In the past.........having fallen and having my arm or leg get hung up in the rear wheel, I would definitely want this device to be functioning. I really lucked out at the 88 Barstow to Vegas race when this happened, luckily the throttle didn't get pulled open as my arm got pulled in between the swingarm and the rear tire. The only thing that saved my arm was my enduro jacket and the fact the motor died pretty quickly.