These fins are amazing in all respects apart from performance in anything other than zero current.
They are superbly light-weight, compact and comfortable (really good foot pockets) BUT they give nearly zero propulsion in even tiny currents.
Hence why I say I am disappointed by these fins as, but for the impotence of these fins, I would rate them as the best ever. I guess you just can't have a"perfect" light-weight powerful fin for open water, but for cave diving these would be the absolute pinnacle (IMO).
I think the Mares X-Stream fins (which are so light - 0.85 kg per fin) give the best "light fin" performance but their drawback is their length.