It calculates my data consistently. Consistently I tell you! And its free! CONSISTENT and FREE! I dont ride with a ton of sensors, yet MMRide was never consistently connecting (even as an MVP) and Strava charges $79 for real-time data. CONSISTENT AND FREE!!! WAHOO!!!
Cherry on top: I can upload my data to both sites/apps immediately and get what I want out of them socially (membership cancelled!!!)
Note: road bike with wahoo speed/cad and UA HR monitor on iPhone 5S Bluetooth with RT data display running as my cycle computer (with customizable screens - that show RT data... consistently!).
Z.-man about Wahoo