Splitfins are useless. They allow people who don't have proper kicking technique to move by moving their feet, but without kicking.
Yet another spouting only his opinion. I go back to the notion that who really cares what fin people use? If they like paddles, splits or hinged - good, I happy you like them. What purpose does it serve to bash others fin choices?
Since there is NO real hard scientific or engineering data to support one fin design over another, we are left only with anecdotal and personal opinion to make our purchase decision. Buy and use what you like.