I've been using it for 6 months and really like it. I plan my workouts, so the calendar interface is great. The biggest benefit for me is the fatigue score and the form score. I can train for long stretches without rest days, but then with no warning, I will hit a wall. After a few months of data, I now know the fatigue and form scores associated with that wall. It allows me to plan my rest days rather than wait for my muscles to quit on me mid-ride.