I had the Power pod on my bike for a couple of years. for a long time it gave data that made sense. where it fell short was when trying to do structured intervals on windy days. the power would bounce all over the place. If all you want is an "idea" of your power, the Power pod is a cheap alternative. the wind stuff is interesting too. If you are seriously training with structure, then wheel, pedal or crank based direct measure power meters are needed. IMHO