I only wish that there were more examples of people wearing force fins without dry suits and sneakers as that is not very practical down here in the Caribbean.
I have two sets of Force Fins. One I use with my drysuit. The other set is a size smaller that I wear with short ankle booties. I take them with me to the warmer waters. I will never waste my money on traditional fins again because my legs don't cramp with Force Fins. The other nice thing about having 2 pair is sharing. My smaller set is currently on loan to a fellow diver on vacation in the Caymans. I'm sure he will return a convert.
I guess you can call me a Force Fin evangelist. (There's a Force Fin ad campaign or a Buffett song somewhere in that last statement.)