The Go-Sport, my experience, is that it is very efficient for the input provided due to the pre bent shape and the snappy tip. Fins do not know if there is current or not. They respond to the power input and a good kicking technique. Some are better than others in terms of efficiency and I would rate the Go-Sport as a particularly efficient fin both for flutter and frog kicking. We will just have to agree to not agree
. I stand by what I said regarding the Go-Sport fins as being a good all around performer, efficient and does all kicks well.
I would rate Force Fins and Force Fin Pros at near bottom of all around performance though they flutter kick well, that is about it. And I have had and used both.
James