Got a TomTom One a couple of years ago which has seen me allround Europe. Particularly useful navigating cities. Very easy to use, takes a little getting used to some of the directions but you quickly get to understand what its telling you.
I've never updated mine but rarely find changes, however might update it in a year or so.
Screen is very clear to read and contains a lot of useful info. Not easy to type in postcodes on the move, but then you shouldnt be doing that anyway!
Handy features like finding petrol stations either nearest or on route.
Time to destination is always uncannily accurate too! Rarely send me into rivers / across fields (the one built into my Honda seemed to have a random selections of bridleways which confused things often!)
I had one before which picked up travel alerts (one in a Lexus, one in a Honda) but really a waste of time - tried sending me on a 70-mile detour round an alp once, instead of a 5-minute queue!