Anyone have factory NAV?

[fastM]

Just wondering if anyone has the factory in-dash NAV unit; I'm thinking about upgrading to it; curious as to how well it works, is it easy to use, how's the screen visibility, etc.; before I drop 2 big ones on the unit.

[Jim Z]

pluses- big, bright screen; the map disc is in a different drive so you can leave it in all the time while using navigation; multi-line text display which comes in handy for satellite radio.

minuses- not touchscreen; the "joystick" used for navigating menus is fidgety.