I'll just add that I motor a lot more than I'd like. The wind dies, or its on the nose, or I just need to get somewhere so I'm motorsailing. My fixed three-bladed prop was fine - functional and got the job done. I definitely appreciated it over a 2-bladed prop when powering against current or (more usually) chop if I wasn't sailing, which is preferred. But when sailing it just slowed the boat down (more than I realized), and the prop walk in reverse was something you had to consciously contend with. Yup, I could use it to my advantage too, but often it was just a PITA. I could always feel/hear it turning when sailing too, as Yanmar's bulletin directed the transmission be placed in neutral when sailing with the motor off.
This season I replaced it with a three blade Flex-o-Fold and even though its early in the season I couldn't be happier with the change. We can discuss the relative merits of folding vs feathering - but while interesting, I don't think there's a noticeable difference in performance for the purpose of this discussion from the OP. I'll just recommend wholeheartedly he consider one or the other and take the plunge. I have gained NOTICEABLE speed through the water with this prop, up to a knot under many circumstances up to 15 kts of wind. And there is absolutely no propwalk anymore - I just back up straight (well, if you zero out wind and current). There's no sound or vibration when sailing with the motor off. I am almost at hull speed at my cruise RPM now, which is nearly 2 kts faster than the same RPM with the three blade fixed prop. It is - hands down - the best upgrade I've made in three seasons. I nearly bought a spinnaker instead of the prop (budget!), but this was the right choice.
So do your research on folding vs feathering, make your decision, then your best deal, and just do it. Buy once, cry once. But every time you leave the dock you'll appreciate the upgrade.
YMMV.