I found out something about CoPilot yesterday that wasn't too pleasing - although many individuals won't find this as an issue.
Eventually, the Nexus 7 I have will be used in the car for watching OBD II codes, music playback, navigation, and the like.
Yesterday when I was playing music, I also had CoPilot running as well. When CoPilot was ready to speak a turn instruction, the music fades away for the instruction. Unfortunately, something is broke with the CoPilot instructions - because they would not speak while something else was playing - so you couldn't hear the turn-by-turn instructions.
I closed CoPilot and fired up Sygic. Sygic had no problems. The music faded down, the instruction was heard very clearly, and the music faded back in. So there has to be something with CoPilot that needs a fix.