ive herd that they are really flexy, i think it is because they are quite wide and the spoke drills are all in a straight line, i think that if the drills went to the other side of the rim it would make them stronger, hard to explain but  im not too sure but i think this would make it more stronger if the spoke went from the opposite side of the rim to the other, i know bmx rims have started doing this (fly bmx rims) because it makes them stronger  martin