The F Model US puts a nice variety of shot shapes into a players bag with its unique flight tendencies. The US designation for understable is apparent out of the hand thanks to its high speed turn which makes the disc drift right for a right handed backhand shot. What makes the flight unique is its noticable finish at the end. This gives players with lower arm speeds a nice disc to throw longer S shots with and those with more power a nice understable option that can handle some torque.