I ordered these, and returned them, switching to XC100s. The XC100s have the power sensors in the left pedal, which works great for me. Something in my right leg requires it to point about 15 degrees right of center to allow the knee to point straight ahead. If the right foot is straight my right knee points in and hits the top tube. Long story short, I bought Pearl Izumi Canyon flat shoes. The left shoe has a cleat that pairs with the left pedal allowing me to "train with power". The right shoe doesn't have a cleat because I use a flat pedal on the right, allowing the foot to point 10-15 degrees away so my knee doesn't hit the top tube. I recently rode the Levi's Gran Fondo piccolo course (40.2 mi) with this setup and it worked great. I did forget to unclip (once) and caused a slow domino scene with a few bikes and riders to my left. My bad. I prefer to have at most one leg clipped in. It's nice having the power meter in a pedal. It's the only way I could "ride with power" with the rental I reserved in CA: I ended up taking my own bike, and canceling the rental, but there will be more out of town rides.
At this point in my training I just need basic power measurement. I don't need the refined measurements individually for left and right legs or a power value that is 100% accurate. The Garmin Rally RK100 single sensing fit the bill. The power measurement I get from actual bike riding seems to match well with the values I get from my Tacx trainer. That is to say that the same amount of perceived effort seems to register the same power values on either.
The single sensor power pedal is good for me
I gives me good feedback at a reasonable price
This is a great alternative to crank-based power meters, and easier to install/swap with other bikes. Haven't had any problems so far. No noticeable difference from my older Look key carbon blade pedals.
