I used the GPS receiver in combination with Microsft Autoroute 2011 for 6 weeks and 8,000 km of driving. Worked very well as a mobile map in conjunction with a 1:200,000 Michelin map. Great for navigating through/into/out of towns and cities so you don't get spat out of town in the wrong direction if following "Autre/Toutes Directions" signs. Also great for navigating on the tertiary roads which are often not signed to discourage traffic.

I like this solution better as we could change routing on the fly. It'd be better on an old-style tablet computer as a moving map (the UMPC we were using isn't much bigger than a 5" GPS).