I have Force Fins Tan Deltas, and I like them. I had used Force Fins Pro models before I got the Tan Deltas, and they took some getting used to. At first it seems like you`re kicking a lot and getting nowhere, but you have to modify your kick. Some people say that Force Fins don`t work for frog kicks, but that hasn`t been my experience. Mine are easy to get on and off, they don`t cramp my legs, they go plenty fast with a flutter kick, they work on the surface, I can to frog kicks and go backward. What more do you want? Well, I guess if they could do all that and be a lot less expensive, that would be cool!