Hi -
Great app! One glitch is that the app seems to get hung up if either GPS signal is temporarily lost, or if I have been off course, and then return to the course. The "off course" issue only arises if I have been truly off course for a little while, as opposed to a false but temporary "off course" warning.
I am using the app on an HTC One, Otterbox Defender case, attached to my bike stem using a Quadlock mount. Works great, very easy to hear turn-by-turn directions, even in traffic.
Thanks,
Wayne