I guess I could say that I am lucky my black box has not been rubbish like many other peoples, and I have been able to keep a consistently good score of around 80 (although I do not go out after 10 due to the fact it makes your score go so dramatically down). However after discovering a flat battery twice within the space of a week (when the battery was brand new!!) I got it checked out at the garage to find that it is the dodgy wiring of my black box that is causing a drain on the system. Hastings smart miles do not seem to care that they have a poorly trained mechanic, and have requested excessive amounts of paper work before they'll agree to send someone out to check it. I have complained and they still haven't got back to me two weeks later. I'm literally having to disconnect my battery every time I park to avoid it getting drained, and they don't care. Appalling!!