Doc, my % comparison might break down here . The OMS are more like the SP Jets in terms of size and thrust. They are rather wide and move a lot of water. I do sometimes use a flutter kick or modified kick (and frog kicks and every other kinda kick there is) and when doing so they tend to run into each other, but the frog kicks are excellent and strong. The Mares fins, IMO, are the most powerful regardless of kick style, their length can be a negative in close quarters but in open water for reef diving, pushing my camera and dealing with current they are still my preferred fin. But, let me hopefully get these new Eddy fins in the water with SCUBA gear, not much for diving opportunities for me in the immediate future, maybe in September. I do plan on the Eddy fins rotating in now to number two position displacing the OMS in my dive bag. We will see if they take over from the Mares in due course.