I seen that drive system on another fourm as well...I have a Hobie outback...and what I see of that drive system as THE Major drawback, Is it's stationary mounting of the post atleast a full foot below the keel line of the boat...That's really going to limit this drives use to lakes and ponds.. rocks and submerged log's in rivers would reak havoc on this design...In my opinion.

Where as with the Hobie drive, One merely pushes and hold a foot pedal froward and the fins fold tight to the hull...Kinda handy if passing over an obstruction...