I'm a Real Estate Appraiser, and on the weekends we use my wife's 08 CTS to drive and photograph the sales comparables that I use in my appraisals.
I do a lot of rural appraisals here in Texas, and the Nav system is great! I can find a ranch house down a gravel county road with no problem.....except that I have to wash the car for my wife before she drives it back to work!
I wish I had this system on the 04 Chevy truck that I typically drive. After market is $400 to $600, and that's with my son working for BestBuy and getting it for his dear old Dad!
Rick