finally got to try the much talked about twinfin on the weekend. Jp 68ltr with a 4.8 fly. absolutely loved it, by far the closest thing Ive ever felt to a custom board in the production market.
Nothing to drastic to look at as far as rocker and bottom shape goes but when you turn it, it tuuurrnns ( especially thru the latter part of your bottom turn) and off the top likr a dream. I think it is the first production board Ive ever been able to do a proper cut back on, so i was stoked.
they have minimal volume thru the back half of the board which really lets you dig it in hard which all the lighter guys will love. as far as their planing ability goes the are little slower to pop onto the plane,3 pumps instead of 2, but well worth the sacrifice to get a board to turn that hard. Once it was on the plane it was just as fast as any other board and tracked well up wind.
One thing I would suggest if your going to try one is to adjust the entry angle of your botton turn. I like to bottom turn out in the flats a little so I have enough room to keep the arc goin if you want to hit the lip more vertical, but on these boards it felt like I could initiate the bottom turn half way down the face and adjust the arc whenevr I needed to and still hit it vertically, I loved it

heaps of fun, well worth a try