We had an Autoprop on our Northsea 34 for 15 years and never had a problem with it. No prop walk and lot's of thrust in forward and reverse made close quarters maneuvers easy. You do need to use more throttle from a stop compared to a fixed blade, but you get used to it. Our sailing speed in light winds increased at least 1/2 knot compared to the three blade fixed and our motoring speed increased almost 3/4 knot at the same rpm so we reduced the rpm to cut down on engine noise and still maintained a higher speed. The only contact with the dealer was to order the little zincs, which we received promptly. Wish I could afford one for the current boat.
SV Laurie Anne
1988 Brewer 40 Pilothouse