I ordered this as a upgrade from a solas amita 4 10p I previously had on my merc 20hp. While the amita 4 gave it more take off from a dead start and was the better prop for a heavier load, the top speed took a hit and felt as if the engine was revving higher than it should. After installing the saturn 3 12p, the engine took a little longer to take off and get on plane, but I picked up a few mpg on wot. Granted the engine wasn't designed for speed and I didn't get it for that, this prop adds more durabilty to my boat and the stainless prop draws a lot more admiration to my boat. This is the best price I found for props for my boat and will be conducting business with this outfit from here on out.