| I use an iPaq with TomTom 5. Street level European maps, but they go out of date when new junctions get built so occassionally you need a bit of artistic licence. And I've found some errors on it too... like it tells you to keep left when you need to keep right on the A34 Newbury bypass!
There's a learning curve to get used to using the software but it's not difficult. And I think it helps to have some basic map reading skills so you can relate what's on the screen to what's outside just by a quick glance.
Overall I'm chuffed enough with it. | 
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