I have just purchased this unit ahead of a trip to the USA. If you need a Sat Nav in a hurry then beware as you will need time to set it up! This Model comes with mapping for North America and Europe. After registering the unit, the mapping and software downloads from the Garmin website dashboard took well over four and a half hours.
As for the unit's navigational performance I will post comments on my return from the States.
OK, now I am back from the USA I can say that this units mapping software is very good indeed. I would recommend it to potential buyers.