Thinking about hooking up with one for my Bayliner 175 with the 3.0 liter stern drive.I often run in shallow water and like the idea of being able to change single blades. If anyone has had any experience I would love to hear from you 
In fact, not only did I break off a blade, but I even had one blade EJECT from the hub. The folks at "tech support" for Piranha said "we have never had that happen to a prop of that size." You would think they would be interested in seeing and learning from this "anomaly", you are wrong. I felt the "it has never happened before therefore it didn't happen" message being sent very early in my communication with them.
Bumped bottom many times, the prop is dinged and a little rough but NEVER had there been a problem like this.