I have also found this qoute on the fairwheel bikes' forum (from madcow who I believe know more than most people regarding bikes). Speaking of the merits of ADA and LW he said this:
"I still think that Cosmics feel faster on a flat or slightly down hill ride." (I hope he is talking about the Cosmic Carbones...)
While there may be other wheels that are better for certain applications, personal preferences and so on and so forth I think it is fairly safe to state that the Cosmics are among the best.
The only downside I can think of compared to other "softer" wheels that I've ridden is that I have lost traction several times when hitting pebbles in corners. But I'm not sure if this is due to the stiffer wheels or if it's just coincidence. Maybe someone can enlighten me?
/J