I've read and watched a ton of stuff online about the R18 B prior to me purchasing one... I've concluded that mostly, if not everything online is total BS, the vibration thing - BS, the cylinders interfering with your feet - BS..!!! and the foot brake pedal being awkward - that one was true for me...
In short, swapping my brake pedal out for the RSD pedal has actually increased my use of the rear brake, vs the distributed brakes via the hand lever.
I went for a six hour ride with HD buddies, my R18 B is absolutely smooth... In the end, it doesn't matter what you ride - as long as you're riding...