what kind of issue?
We've had to update our Uconnect once. Worked fine. Although the documentation did say to be careful or something.
In terms of what it does, the bluetooth connection to our phones work great, it reads texts fine, but the voice recognition is somewhere below Amazon's and way below Google's voice recognition. I never use it.
The maps are ok, google maps on our phones are better though. And in terms of remote start, the fob works great. Issuing a remote start command through the app takes much longer, but it is handy when you're not sure if you've forgotten to lock your doors in a large parking lot...
I have never tried Sync but my neighbor doesn't like his much. Still, his is free.