I have a Taurus X with the Nav and Sync, and I have a couple of issues that I would like to see fixed.
Bugs:
About 1 in 10 times when I start the car, the "User Device" which I alway want on my iPod, will randomly switch to my BT phone which doesn't even have music on it. I then have press the source button to get it back to where I want it. It seems to be a race condition as to which device Sync finds first. My iPod is dedicated to the car and is rarely removed unless I want to update the songs on it.
When connecting to the phone at startup, a little popup dialog appears which says something like "connecting to phone". Sometimes that dialog will not go away unless you switch to a different screen (Nav, phone, menu etc.)
Enhancements:
I would like to know which playlist is currently playing.
There is a status bar at the top when I am viewing the navigation system etc. It would be nice if it showed current track and artist.
When I ask for a single track, I would like it to return to the previous playlist when done.
Show me album art and lyrics.
Allow me to alias the user device so I could call it iPod or Zune instead. User device is just awkward.
Allow me to string together commands. "Phone call home" instead of "Phone" <wait> <bing> "Call Home"
Over all it is a very good system, but it does have a some rough edges.