C19's are awesome. i love mine, although the bearings can be a little troublesome at times. they ride incredibly smooth and are very, very strong and very climby. maybe a tad flexy for a heavier rider, but they will almost certainly never come out of true unless you do something really stupid like run head-on into a brick wall.

for what it's worth, viperZ doesn't like them.

i have no opinion of mavic products other than to say that they are overpriced.