Well I went from Great Yarmouth to West Derby in Liverpool (290 miles) on Sunday and it didn't put a foot wrong except for that dead end at the end of my street.
I'm quite chuffed with it as I was expecting lots of wrong turnings but I can't fault it. It beeps when I get near a speed camera and a little icon appears when I'm near a petrol station or restaurant.
Comparing my F20 to the TomTom One I borrowed from a mate I really can't see what the extra fifty quid goes on when you buy a TomTom.
I have an old Navman ICN320, and I can't complan about it, especially for the £110 from toys'r'us! Get's me where Iwanna go, even through the nasty all-over-the-shop roads of the lake district!