I'm using the Wahoo cadence counter along with their android app. I don't have the RFLKT unit so I'm using the Wahoo app on my phone for speed and cadence. It is working great and while the screen stays on the whole ride, I'm not having an issue with my battery. I still have almost half left after a 5 hour ride. I like the screen better than the one used by MapMyRide, bit bold readouts along with audio.

I may upgrade to the RFLKT sometime if battery life becomes an issue or if I want additional features but for now I'm pretty happy with this setup.