I am a French user of Bing Maps.
Seriously I never tried such a bad GPS software. Most streets names are either false or missing. In Paris it shows you some streets but with no names !
But I was shocked to discover that the maps of my city (Strasbourg in France) are more than 5 years old. The aerial view show some old streets or places that did exist 5 years ago but do not exist now. What kind of maps from the middle-age is Microsoft using ?!
Some streets are now completey false.
I never experienced this with Google Maps, which has always been so fast and accurate.
I hate to be forced to use this pathetic Bing Maps. I am surprised that we have still no Google Maps application on WP7. I hope Microsoft is not blocking it.