I walked into my LDS and saw these, and thought they looked stupid and figured they were old. the shop owner asked me if I was checking them out and I said nah. He said they are the best fins hes got. I said, "oh really?" He then showed me the scuba lab review and I was intrigued. I tried them out in a pool and they were awesome. I zoomed around, the comfort was amazing. No kick fatigue, feels so light on your feet and I could swim faster than anyone else and at the end be far less tired.
Anyway, I now own a pair and have 8 dives on them.
I will say this again, they are EXTREMELY comfortable. The bungee strap is better than a spring strap for sure. It fits snugly for me (I wear a size 11 M shoe USA and a Large fin with 3mm boot fits perfectly). I feel like I have room to go on boot size as well and the bungee strap would hold it in. They are very easy to get on and off, again even better than spring straps.
In the water even the slightest movement of your foot produces a kick motion. Unlike regular fins, the kicks with these seem to NOT silt as badly. Other fins can silt from 5+ feet away where as with these it SEEMED like I wouldn't silt and could do the frog kick although I'm still getting used to that kick in general. I think its just that those small movements that produce propulsion with these fins don't silt and small movements with other fins wouldn't product any thrust you end up kicking harder and silting. IDK though, just seems that way so far.
They also are supposedly positively buoyant. My feet sink so I got these and my feet still sink so oh well haha. My boots are probably whats so negative.
I really like mine. For me, comfort is #1 with these (which includes fit, getting on and off, and lack of fatigue). Speed is #2 because I try to go slow. and #3 would be that it "kicks" even without a proper kick motion, which makes them great for multiplying the magnitude of small flutters.
Another plus that I never thought of is that my buddy says they are very identifiable underwater (I have black ones, not white) so they know its me from a distance.
My other fins were full blades and I would really have to work them. These are great.
I think everyone should try these. You'd have to be pretty stubborn to go back to your old fins considering these will be more comfortable and faster. I got mine for $130 which is another plus, as a lot of high end fins are $180+ and still require you to add on spring straps.