The RS-81s are a phenomenal wheel and an excellent value! From what I gather, they use the same hoop as a Dura Ace setup, just with a non level shimano hub. But that hub is still very smooth rolling!

The weight difference between dura ace and the RS-81s isn't enough to warrant the price difference in my opinion.

I have a set of RS-81s that I will never sell because they are that good of a value!