I've been riding the Favero Assioma Duos for the last year. Excellent product and they really have been the benchmark for any sort of power pedal. Garmin had some work to do in order to get back on the top rung, but it appears they may have done it. The Rally RS200s are rock solid AND THEY HAVE SHIMANO CLEATS!!! The only issue I ever had with the Faveros was that they use a Look-style cleat and as silly as it sounds, I just can't run as fast in those. Shimanos are much faster. In all seriousness, the Rallys are great and during use are no different in function than a Shimano pedal, except you get good accurate power. I had no issues with any sort of power deviation due to temperature swings like DC Rainmaker mentioned. Install, calibrate, connect, and ride.