I passed my car Advanced Driving test back in 2002, it took me 2 years from start to finish but my then car got vandalised so it was off the road for a while, it can be done in a shorter time. I wanted to do it to improve my driving, also was hoping for cheaper insurance, but as soon as I told the insurer my car was modified they refused to insure me, however I am with them for my Leon, renewal is in September so will see how much it changes (claim due to Catalytic Converter stolen off previous car). Overall it has improved my driving, I tend to look out for a lot more things on the road now, mainly to spot potential issues with some peoples driving. As said earlier Roadcraft is a very good read to accompany the course.