As indicated above I am really impressed with CoPilot.
I tried NavFree the other week, and although functionally it was reasonably close to CoPilot, the one thing that REALLY annoyed me was that at every junction on the motorway, even if i was not exiting, it would still tell me to 'keep right'. Going up the M6 from B'ham to Kendal, it got rather tedious by the time i reached J36!!
Cheers,