I am thinking of building a 650b wheelset using these rims. There is an OC rim made for the rear. However, it's a retro sort of bike and I think I like the look of the regular rim better. I will use Ultegra hubs. Are the supposed benefits of the OC rim real enough to warrant using it, regardless of appearance? I weigh 180 and have not yet broken a spoke on a road bike. I have not purchased the rims. thanks!