I disagree TOTALLY that splits are bad in current. Let me preface this with saying that I used jet fins the first 30+ years of diving. When I tried splits, I quickly deduced that I needed to use very stiff ones to get the fine positioning control I wanted. Now, as to current....In PNG, I was asked to help set a tie wrap into the mooring shackle on a spot we were going to stay the night. It was on a bommie with the mooring out of the top. There was a ripping current and the divemaster and I beat it to the lee of the bommie. We then had to push over the top to the center of the bommie where the mooring was. I not only beat the divemaster to the mooring (he was 20 years younger than I) but I was not nearly as winded. In short, splits have a learning curve to get the best performance out of them. Some "experienced" divers refuse to learn new techniques. BTW, I use, almost exclusively, the frog kick while diving (except in those ripping currents).