It really depends on your style of diving.... My wife and I are both dedicated jet fin users, we've both tried the force fins, she hated them, I thought they were ok.
They were dreadful for frog kick, which we both use almost exclusively. If you like flutter kicking, then you may really love the force fin, it works well if you keep a very short kick cycle with constant movement. I will say that they are very fast, the few people I know who use them are difficult to keep up with when they take off on you. They are light, and small, so it's feels like there's nothing on your feet with them on.
If you dive in silty environments, you will likely wreak havoc on the bottom with these fins. One of our occasional dive buddies was leaving craters with light kicking about 5-6' off the bottom.... it's like a focused punch of water off these things. Perhaps with time and practice, one could develop a decent frog kick, or keep the silting under control..... I couldn't say.
There are so many different styles... I used the standard, the others could be very different.... I can't speak for them.
I hope this helps, they are very expensive though aren't they?
chris
