I had one of these supplied for a test for a boat fishing mag but it must be 15years or so back. It was a while cos we were using decca not gps.
It was absolutely crap so the mag, in the way that some do, never printed the test which would have upset the advertiser a tad! The prop was for a 40hp mariner and it came with a couple of pitches. One as per the one fitted to the boat already the other blades were plus 2 inches on pitch ( because the prop was so efficient -
) . With the original pitch replacement the motor revved its nuts off at wot. With the higher pitch it was a slug to get on the plane and the wot revs were in excess of those we used to get with the ali prop but the speed was considerably reduced. My conclusion was that the blades were flexing under load, and my opinion was unprintable. BUT could be handy to keep in the boat as a get ya home spare as its light and packs away.