Fitbit replaced it, but who makes a sport tracker that isn't sweat proof. I then got a Fuelband and hated it, can't share data and it doesn't work for cyclist.
1) The Fuel Band is water resistant. I even wear mine in the shower. Sweat for the Fuel Band, is, well, no sweat. (The Flex is also water resistant and can be worn in shower).
2) I'm not sure what you mean, you "can't share data"? One of the big "sells" with the Fuel Band is that you can share and compare with friends. I don't use that feature, but you can authorize people to see your data at Nike+ or have it automatically uploaded to FB or Twitter.
3) What band does work with lower body? My experience, and I've used them all, is that they depend on upper body motion. I know you can manually input cycyling info into the FitBit or UP apps, but there are many apps that let you do that, but its not the same as automatically measuring activity which is the point of these bands. That is more supplemental.
I'm not arguing for the Fuel Band, I have my issues with it, but I don't understand the hate for it. It's really the "jack of all trades" of activity bands -- yes master of none, but convenient and I've never lost it like my FitBit One. If the Fitbit Flex was the One with a band it would be more of a winner.