Sync 3 has its issues. I hate the handling of radio presets so you have three separate panels for Sirius and three separate panels for FM. In my BMW, you had one screen for presents, you could load any source on that screen too. So, you just had one button to push to get to all the stations you might listen to. Way more sensible.
I would also say that Sync 3, although powerful and intuitive, is not very attractive looking.
Its a good system, no doubt, but not perfect.