My only concern is that when you ride clipped in, the platforms don't really come into play. If you're sometimes riding in regular shoes, these pedals will likely be fine, but if you intend to ride clipped in all of the time, why spend all the extra money? M520's are pretty easy to use and very reliable, and a lot cheaper. In addition, I find that adjusting the tension on the 324s is a lot less user-friendly than with the 520s.