A few minor annoyances:
Routes don't cancel once you arrive at your destination. I have to go in and select "cancel next stop" or else it will continue to guide me back to my destination.
Maps often show streets that don't exist.
Several times I have started up CoPilot and have had my phone in landscape mode during startup. When pressing the X to exit out of the little menu on startup, it would bring up a keyboard on top of that menu with no way to exit out of that. Why it brings up the keyboard there, I have no idea because there is not even a text input box. I would have to press the home button to start all over again. I've reinstalled the app and it doesn't seem to have happened since then.
I mainly use CoPilot to be able to read the street names for my job. I have used it to help me find an address about ten times. It has only been able to find an address 2 out of 10 times. The other times, it would just come up with a nearby address, say 7750 instead of 7749. Other times, it would not find the address till I tried searching by zip code instead wasting minutes that I don't have.
All in all, the app is still useful but needs some work.