I have the NAV.
IMO, NAV is worth it for the following reasons:
- The pop-up feature is the killer app in the interior of this car - if you're "gadget positive", there's simply nothing better than this feature.
- It's integrated with OnStar - get your directions downloaded to your Nav and you're never lost.
- It's integrated with your iPod - scroll through your iPod via the centre console wheel and/or your steering wheel controls
- It comes with the integrated 40 GB hard disk - rip your favourite CDs to the hard disk - you'll always have them (with or without your iPod)
I don't even question the money I spent on this option as it was well worth it.
Again, IMO.