so I have under consideration the investment in a Max Prop or Kiwi prop. I know the AutoProp will not fit. But I am concerned about longevity and reliability. My three blade fixed may slow me down a bit, but it never stops working. I do not haul the boat each year because the annual transition from fresh to salt water and back again means a scrub each spring is all I need. do the feathering props need annual maintenance and grease? I know some of you have feathering props and I would like to hear reports on reliability and longevity and if the increase in sailing speed is actual as opposed to theoretical. thanks.