I've got Dura-Ace C-24 7850s and my very much better half has RS80s. The rims are identical. And they are today's rims - sorry, but Howard is bang on the money in saying the Open Pro is yesterday's technology. The real magic is in the rear wheel, with the asymmetric arrangement but the clever thickening gives a fantastic ride. We take our bikes off road a good deal, and there's not been a the merest smidge of deflection, despite there being only sixteen spokes on the front.