My 1st introduction to Force Fin was an ad in "HDS Magazine" around 2000. I was so impressed I immediately gave a look a the homepage. It raised lots of questions, but got my hooked somehow : there was something and the matter needed further inquiry, I wanted to test them. Sole problem : living 4h away for the closest LDS and only one shop in Paris was selling them.
Time passed, moved several times, kept building my diving skill and met around 2002 a German diving instructor in Cyprus who was diving Force Fins Pro and wouldn't dive anything else. Couldn't try them though : wrong size. Curses, failed again !
Then 2 years ago, I got a pair of XXL Force Fin Pro second hand, on a diving forum (as there was no longer any dealer in France, I had almost given up). Tried them in the pool, and was perplexed : something was right. I ask some questions here, and some users and Bob himself gave me some advice. After 2 dives I was convinced, you just need to forget whatever you've ever learnt about using fins.
Those are my favourite fins now, except when diving dry : need a pair of XXXL for that. I dive the Med, the Atlantic, from shallow to deep water in the open ocean, OC or CCR, and about once a year (when no covid's around) abroad : tropical or not. I got some questions, some doubtful look, a tease from time to time, but once underwater even loudmouthes tend to stay shut, so I couldn't careless.
Just know only 2 other Frenchies diving Force Fin, but like me, they wouldn't give them up for all the gold in the kingdom !