Rudders and props, etc are old technology. Good point Eastie. I'll give you that. Our Tige had 500 hours on it when we sold it. 99 problems on that boat, but the PSS wasn't one.
The graphite collar is a wear item I believe, but the service life is very long. I've yet to hear firsthand of one wearing out on a inboard ski boat. I still think its far better technology.