I have never owned a factory installed nav system, but I have the Kenwood P-NAV6019 system and love it. I have Sirius, ipod and video. I know it does a lot more that I don't use it for. They were even able to get the back up assist to operate, which they originally told me they might not be able to. Not to say that the Pioneer doesn't. From what I heard the main selling point of the Kenwood was it utilizing Garmin for the nav technology. Good luck.

Ken. 2007 Aspen Limited 5.7L Hemi

 

W just replaced the factory Nav with the Kenwood DN-7100, iPod interface, Back-up camera, and new bluetooth function. Love the Garmin interface and touch screen capability. Used Signature Audio in Scottsdale for this work.