My niece is after insurance and online she can save £50 with a box. Iv'e never had one so not sure how these work. Say she gets one and when it comes to renew in a years time will the insurance company turn around and say 'on this day you did 35mph in a 30 so its now going up'? Are they a scam? Years ago I was asked by a broker to have one fitted to halve my insurance. I told them 'look its a R32, I won't be driving miss daisy in it'