Wish I'd read the reviews first. Its such a painful device, making me down for ' hard braking ' or accelerating too quickly....you sometimes have to when you drive if some moron suddenly stops in front of you or unless you want someone else rear ending you. I'm not a fast driver but sticking just on or below EVERY speed limit is ridiculous. I do lots of 5 or 6am drives when no one else is on the road so going 5 or 10 mph above the limit isn't awful. No chance with this thing. Even blamed me for going round a roundabout too quickly when I certainly did no such thing. Luckily I've realised this within the 2 week cooling off period so going to ask for my money back and pay £100 more to get less frustrated!