The pedal drive system is called the Mirage Drive system, I think.
I hope to get one of those this year sometime. I first saw them being used around Maui...I saw a couple of kayaks cruising by at a pretty good clip, and then realized THEY WEREN'T PADDLING!! Cool!
A member of our fishing club has one of these, and I tried it out last year on a local reservoir. Works GREAT! What I like is that you can fish or troll by pedaling, using your hands free to work the rods (s). Should also work nice for the river!
David Merical
St. Louis, MO