YellowA you sexy minx.
I personally have a TomTom500 and I've found it just about the most usefull toy I've ever owned. So so handy, every journey is a piece of piss, especially if it's to a place you dont know at all. It takes the stress out of a trip and hitting 'home' for the return journey is so nice.
Its also great even if you know the route, just in case you get stuck in traffic or diverted and need to use roads you dont have the first clue about. The speed camera alert feature is also brilliant.
I've found it makes my trips around the country a complete doddle. No maps, no stress, just good concise directions door to door.