What are the differences between the two? I'm looking at a C'dale Bad Boy and the Bad Boy Ultra. The Ultra has a sloping top tube frame and regular has a horizontal top tube. I happen to like the horizontal style better, so other than that, I really want the Ultra. Does a slope have an advantage over a horizontal tube somewhere? Or are they just for cosmetic purposes? I suppose it would give me more clearance if I slid off the front of the saddle, which I have never done and can't really forsee a situation where that would ever happen. Possibly it accomodates the longer fork you have with a front suspension?