The most important features are the wide-screen display, the pre-loaded European maps, and the pedistran mode (whereby the nav unit adjusts its calulations based on foot-speed rather than car-speed).
We expect the unit to be of great use when we spend a day driving through Tuscany's rolling elegance.
The card slot is for an SD card rather than a micro SD card, but this is really not an issue as any micro SD card will fit into the larger SD adapter.
My little boy loves the touch screen!

I will soon put the navigation unit to some work when I go to a baseball game in Atlanta (go Yankees!). I will update this section afterward to provide information on the features I use and how I perceive them.