The Smartnav is expensive, can't be moved from car to car, poor reliability, had 3 now and they all broke down, expensive cost of engineer's visit to repair it. I will buy a portable sat nav next time.

I have had this Smartnav installed in my car for three years and I use it 2 - 3 times a day. It has saved me many hours of sitting in traffic jams as the Trafficmaster works brilliantly. In all of this time it has only failed one or twice and this has been due to poor mobile phone coverage.

A bit more expensive than a TOM TOM and you have an annual fee but I would definitely purchase this again.