Synthmode,
This is not the only forum that you can get feedback on the Rosen units.
To answer your question, i have a '09 Tahoe with factory nav, factory backupcam and bose centerpoint. Thanks but I finally found a place to get the metra part.
IMO the problem with the Rosen unit is that it does not integrate with the oem backup cam and you lose some of the rear seat entertainment function. The metra harness brings out the oem backup cam but with the adapter you cannot plug the factory harness into the Rosen. I don't know what else is on that harness but seems it would be lost. One forum member on gm-trucks dot com said the -N11 version fixed the oem backup cam and the RSE issues but when I asked him to verify he did not respond.
I also sent an email to Rosen directly asking them about the -N11 and they did not respond.