I finally got to try the Force Fin Tan Delta UDTs last week on a 58ŽŽ° day off Deerfield Beach, FL. I have used Force Fins off-and-on since the fall of 1982, but this was the first pair of Tan Deltas for me.
I used the old Voit UDTs until I tore the heel strap of one of them in 1970...