Doesn't seem practical for commuting, as I know my route while commuting. This would be great for touring, running errands to unfamiliar places, or even trying a new road ride in an area you are not familiar with. I tried to use my phone mounted on my handle bars to guide me on a ride in Sonoma, Having the screen on burns to much battery, and the sound prompts were hard to hear.

I will wait to see how the reviews are for this but might consider one in the future.