My observations with bad knees and a occasional back issue. I ride in the dreaded “C” position due to short stature. When I hit a large bump I can feel it through my spine, but there does not seam to be any lasting discomfort. On the other hand my shoulders sometimes hurt. I love the forward controls on my knees and the stretch out to the hwy pegs is nice. The position may add a little extra seat load and some monkey rump.
“You can’t have it all; where would you put it?”
“You can’t have it all; where would you put it?”