Tom Tom is pretty good but not quite as good as one that came built into a car that I had - don't know whose satnav it was. Main difference seems to be the quality of the database - it occasionally thinks I'm in a middle of a field (when I'm not, honest) or tells me that I should go up a one way street the wrong way. Don't know what the new Tom Toms are like but if the database and processing is the same you may find the same little things. That said, if I hadn't had the built in one first I would think the Tom Tom was the dog's...........