I agree with Tom Kirkman. Hobie's Mirage Drive is much more efficient than prop drives. I also had a Native Propel Slayer 13. For example, on one hour timed cruise speed runs, the Hobie Outback covered an average of 4.51 miles (with Turbofins) while the Slayer averaged 3.89 miles -- not even close. Props are magnets for the sea grass or seaweed that you would find in the bay, can clog and seize. You have to stop and pull the junk out by hand. The pedal cycle is longer on a prop which is hard on my knees unless I am tooling around at 2 MPH, and, like Tom, I find the pedaling effort higher and the stroke speed uneven. Finally, the Propel makes a whirring noise while operating (gear in oil bath system) that I find annoying. Not surprising, I have noticed that most of the prop drive fishing boats at my local lake stay within about 1/2 mile from their launch area, while the Hobies are much more widely distributed through the lake. I ended up selling the Propel after a few months.
The only other Mirage Drive copy that I know of is sold by Pelican. The company does not recommend them for marine use and the one I tested showed corrosion damage after only 6 months, the seat buckles had failed, one crank arm had broken (both replaced under warranty), and the drivewell was collapsing (see pics). The drive was hard to operate and slow. It was cheap but there was no quality -- it was a piece of junk.
Pelican corroded buckle, rusty spring

Pelican both seat buckles broken

Pelican drivewell collapsing
Hobies may cost a little more, but IMO, they are definitely worth it. If you've noticed, the resale values are up there -- they hold their value over the years.
