I bought a used Hartco for my 2013 F6B. It was designed for someone 6' 1" and 230lbs. I am 5' 11" and 225 lbs.
It is great for long trips. Sits a little taller than stock and seems to put a little more pressure on upper thighs. This evens out the pressure on my butt and gives me the ability to ride longer distances between stops without discomfort. Overall I really like it and probably won't look for another seat anytime soon.