On "longer" trips, I typically run between 400 - 600 miles per day. My longest was just over 850 miles on a trip from the Dallas/Ft Worth area to Big Bend National Park with a bunch of friends. We took several detours, including the Davis Loop (great ride). I did that on my 2000 Roadstar, with highway pegs and a Mustang Saddle.

I was actually pretty happy with the Mustang. It sat me slightly more forward than the stock seat, which took some getting used to, but it was very comfortable over the distance (I did several cross country trips on it).

Following that day's ride, I went hiking for several miles with no soreness or fatigue, so I guess that's as good a testament to the seat as any.

I haven't decided if I'll replace the stock seat on the F6B or not, and if so I haven't decided which I would go with.

FWIW, Mustang will have an F6B seat by the end of October.