Interesting product. Get them a size smaller.
I finally gave a good run at these fins in a solid swell. I usually prefer large fins although I’m only 160/ 165 Lbs., so I bought the large set. The fins worked well on tight and punchy head-high waves on my squash tail. I’ve been riding Twin + 1 in smaller waves, so I felt some drag from the center fin at the beginning, but when I worked a bit for speed, they responded immediately. Just a tad hard to turn because the center fin has some depth. I recommend sticking to the fcs size chart on these (the medium probably would have served me better). Worth the money? Not sure yet.