I installed the tall pilot option, and love it. I am 6'3", and I also moved the bottom of the seat hinge back about 1.25". It makes the plane much more comfortable, and doesn't take any useable room from the passenger, unless they plan on sitting in front of the stick.
I had to bend the rear stick some to clear the seatback after I moved the hinge back, but it doesn't bother the passenger.
A friend who is about 5'10" did some inverted flight with the plane and indicated that he had trouble maintaining level flight because he couldn't push the stick far enough ahead. (his arms were too short)