I received the update via Fedex yesterday. (Fedex still shows that they haven't received the package for shipping?) Installation was simple enough ... with car turned OFF, tilt the screen for access, remove the old SD card, insert the new one. Power on the car, receive a message about updating, and a gas gauge shows a two minute countdown. Turn off car, wait 15 seconds, turn it on, and the system starts as normal with the new map. I'll look for fixes and changes in my area over the next few days.
One odd thing ... the email I received from Navteq confirming the order included an activation code, but the system never requested one.
I doubt it was worth the price, but ... I have no self-control.
Cayenne Red SL-e, Reserved: 5/10/11. Ordered (Santa Monica Nissan, now defunct): 5/10/11. Delivered: 08/31/11.