See poll below....
Drivers who live in police states will find it handy where the speed limit changes and cops are looking for drivers not reducing speed. I drive with my foot on the accelerator and moderate any reduction in speed.I did the trial - turned it off immediately, did not like the speed changes.
When a municipal cop gives you a ticket for not slowing down to 25 you will wish you left it on. I am from a police state where muni cops are always looking for drivers over the speed linit.