I bought my wife a 2009 SEL in Dec with Sync and Sirius. The vehicle had travel link with the sirius radio. I wanted a Nav system installed. The dealer installed an 09' Nav system. The sync works, the nav works, the sat radio works, the travel link works. Only difference is that they added one of those external magnetic roof mounted antennas. Of course as soon as i got there i told them that it would not fly like that. They ordered another factory GPS antenna for the rear of the roof with 2 connectors. One for Nav and one for Sirius...
Hope that helps!