Well the issue is mainly with the laggy software, the interface which is slow to react, the Bluetooth communication which can be spotty, I'll get the occasional crash, the USB connection will "lose" it's position (really annoying if you're listening to an audiobook, and there's no quick way of jumping to a specific spot).
Those are a few of my issues. So I have Sync 1, with navigation.
Is there a link to the upgrade to Sync 3? I know that there was the option in Sync 2, but through my investigation, it didn't look like Sync 1 had the option>? Honestly, I don't NEED navigation. I have my phone with Google Maps which serves me very well. I don't think I've ever used the integrated navigation. I need Bluetooth streaming and calling, USB and aux connectivity, and the radio. Nice to haves but not required would be interior media storage, navigation, CD player.