[tony20009]

The nav makes dealing with a lot of the car's other functions - radio/sound system, door lock setting, light settings, dimmer setting, etc. -- far easier. Additionally, it's a good deal easier to access the HD2 and HD3 variants of radio stations, and you get more info regarding the lists you play via your iPod: elapsed time of the current song, what song you are on out of X many songs on the list, etc. I've encountered no issues with the Nav.

It's a computer you can't program or download to from the WWW and is thus unlikely to acquire a virus. I wouldn't have any reservations about having it.