I've owned one for a couple years and being made of alum cannot keep it from falling apart!
I had to buy another hub @ $300 and finally gave up! But what a hole shot!
I had one on a 1989 Hi-Tech 20.6 with a Black Max XR4 200...It was one of the most responsive props I ever had, but that engine only around to around the low-mid 5K range....It was killer out of the hole with the Jack Plate and Trim buried, and then Trim up and you would feel the prop give around 3800-4000 RPM....it was like having a two speed transmission in the boat....Too bad they don't have one that will REV high...