Since I am a pretty strong and hard recumbent rider I will probably get the turbo fins quickly.
I also have a 13' Revolution and a recumbent bike (an Optima "Orca" high racer). I'd be interested to hear what you think of the seat and pedal position of the Revolution. Some people complain about the comfort of Hobie seats, but they work fine for me. The pedals on a Mirage Drive kayak are higher than the pedals on many recumbent bikes, but about the same as the pedals on my Orca. If you're used to biking in hilly terrain, you'll probably find cruising and trolling in the Revolution easier than recumbent biking, unless you feel compelled to blast along at speeds over 5 mph for extended periods of time.