My brother just got back from Hawaii, and received a board from Robin Mair, with Robin's Hanalei Quads, with the Hammer Fins in the rear.

Initial feedback - My brother was really surprised how well they went.

You can stop reading now, if you're not into quads, or not into anything that looks experimental, or not mainstream!

(PS - this is not an infomercial, and I have no financial association with Robin Mair, Mair Surfboards, Hanalei Fins, or Pro Box)