I just finished 273 miles in 5 days on a Motobecane CXX. It is my first "real" bike, so I can't compare it to a rb, but it served me well on my supported tour. My favorite CX moment was when I was alone for awhile, ahead of everyone else, and realized that our map maker had messed up and had us on almost 2 miles of sandy 2-track. I rode it, but the 23mm roadies wouldn't have been able to. I did see 32.7 mph coming down the last good hill, and felt very secure on my 32mm tires.