I have a 6'2" Stretch Quad with Future Vector II fins. They are sick so I never thought about changing them. I've been riding a 6'1" round tail Aviso board the last week and its really awesome it feels real solid in the barrel and super fast on the face. I might be better bigger like 6'4" but I definitely like it.
i weight 180, 5'11". not sure if you surf anything like me, but i LOVE this setup, best one yet:
futures vector QFEA front fins
4" quad rears
unbelievable how well this setup works. i just picked up the pivot rear setup to try in bigger surf, but i loved the QFEA two weeks ago. experimenting with the quads is the bomb, its amazing how much the quad changes from fin swaps compared to a thruster