The 300 seat is horrible. I switched out to a Corbin
a bit better but still wasn't happy so got rid of that one and got one from a guy Terry Adcox on ebay. It was better but still not perfect for over a couple of hours in the saddle.
So now if my ride is two hours and under I just use my custom seat he made for me but if it's going to be longer I bought a AirHawk and have a sheepskin cover for it. ( these seats can get REAL hot sitting out in this Florida sun)
With this set up I can go for about 4 hours before I need to get off and stretch a bit.