Around here we use stainless props on all of our boats except the 2 with Go-Devils and the airboats, which have composite props. We have about 20 boats in our fleet that vary from 20 hp to about 150 or so. Mostly Evinrudes and Johnsons. We've been using stainless since the early 1990's. I have not heard of a need for a lower unit replacement yet. Oh yeah, there was the whaler with the twin I/O's that we converted to outboards. But IIRC that was due to a maintenance issue not mechanical damage.

Not saying that stainless props don't have the problem, just that we haven't seen it.

My s-in-law swears by bronze on his Chriscraft. There are repair shops around here that rebuild props and I guess bronze are good for that. What do they use on offshore workboats and shrimp boats? Anybody know?