The least expensive available. So they are an excellent value. The speed sensor is conveniently placed on either hub. The cadence sensor is somewhat large for a cadence sensor. So on tightly spaced frames aren't practical. But if you have enough space between your crank arm and your frame they do what they need to do. I think that the bluetooth smart is a little slower to respond than ANT+. Not a big deal if you have a bluetooth smart GPS and don't mind the slower response. Sometimes the speed sensor will lose connectivity momentarily, which is a little irritating, but not too much.