Try digging a rocky bottom or stump by accident and you will see why I run a SS prop. I had to unload and load my boat on an unimproved ramp on KY Lake today due to the lake being 4 feet over summer pool. I ended up in the gravel both times that would have slung the blades off an aluminum prop. I'll have to dress the edges of mine with a file but it didn't hurt it. I don't like getting my SS prop into the bottom but at least it will live for the next trip.