Non-round rings fell out of favor 20 years ago because they screw up your spin. I guess that means it's time for them to be 'rediscovered' again. The Q-Rings' claim to fame is that they are also adjustable WRT where the easy part of the stroke can be placed. Whereas Rotor cranks work to eliminate the dead spot by varying the position of the crank arms in relation to each other, the Q-Rings merely try to speed your foot through the dead spot. My experience with Biopace and Ovaltech in the early 80s led me to conclude that they were marginally effective for the granny ring and a waste elsewhere.