I'll agree that frog kicks are not the easiest with the splits. They are certainly more efficient with paddle fins.CBulla:I have tried them and found the kick cycle to be mushy. For frog kicks it felt (I can't see my legs, so I'm guessing here) as if I were having a hard time getting a solid cycle with that as well. Backing up happened at about 1/3 speed as did the helicopter turns. They actions did occur, but it took considerable more thought and time to create the result. I came to the conclusion that for me they would be a suitable fin for drift diving but not for dives where more movement is required.
Conversely, I have a dive buddy (Reefguy) who is rather proficient with these fins.
Also, I'll admit that most of my diving is drift diving (some shore diving too)...
I do generally use a flutter kick, unless I am close to the bottom or in a wreck, then I use frog kick to avoid stirring things up.