Yes, I'm a Ford Sync user (a 2012, a 2013, and a 2014 model).
On my flagship every-bell-and-whistle edition I have been frustrated many times. When I bought the newest one, it was to replace a car with an 8 year old Toyota system. Before I bought it, I saw that it wasn't as polished and easy to use as my old one (partly since I was familiar with it, I'm sure). The Navigation, in particular, was pretty uneven: a couple of things better (able to do limited route setup while underway, for example), and some worse (reoute preferences hard to use, too many menus deep to do many things).
Knowing that, I felt confident buying anyway, because this is 2014: software can be UPDATED. I was sure it would be fixed eventually.
I have gotten an update. It changed nothing that I have found so far (good luck finding a list of issues addressed) aside from requiring that I pair my BT devices again and download phone books.
Now the ultimate insult. Ford acknowledges that their system was... poor. They announce a much-better version (they hope).
And it is NOT AVAILABLE to those of us who have put up with the one they had.
Come on. QNX runs on nearly anything. Are they seriously unable to upgrade the existing hardware? Really?