First thing is that they are really made for tall, thin Europeans. I am none of those things. Just getting on and off is the worst part. The riding position is pretty neutral, although the knee bend is a little more acute than would be good for my knees. I'm in need of a full knee replacement on the left side, and I'm needing L1 and L2 fused in my lumbar spine. The F6B riding position seems more comfortable, and certainly easier to get on and off, but I want to rent one for an entire day of riding to be sure.
This is my bike.