OK, I haven't had it long but there is not much computer interface. Just to down load newer maps and update operating system version. I might be wrong but I don't see much more interaction with the computer than that.
There is something like 7 million points of interest built in. It is all touch screen and takes less than 40 seconds to manually enter a destination (multiple destinations obviously take longer). You just press the first letter of the state, then tap your state when it comes up, then first letter of the city, street and then manually push in the street numbers.
Has fastest route, shortest, scenic and a few other's. You can avoid toll roads, save favorite destinations so they come up with one press after they are entered. If you have a bluetooth enable phone you can make hands free calls through the GPS, it will dial for you. It will also use your cell phone to retrieve traffic information and re route you around any delays.
It has a variety of map layouts, views, colors and day and night settings/colors, if you miss a turn it automatically reroutes you the quickest way. I have a turn out of my house that is only about 30 feet long and it still advises me with perfect accuracy. It has a ton of languages and different voices to select from.
Oh yeah you can also preview your route, so you can take in into a motel room at night, enter your destinations and then hit preview and it will drive you along the roads and show you the names so you can get somewhat familiar with the turns before you get there. Although it advises you well enough I don't think you could miss a turn. It even tells you to move into the lane you need to be in so that your prepared.
Hope this long winded spill helps you out, thats all I can think of.