Chuck, I have one on my current boat and for 4 years have had not a single problem. My last boat was a 1989 45" Californian MY with twin engines. I had PSS seals put on it at a time (2005) that turned out to be a shortly before I sold it and bought my tug. It was not a straight forward job on the '89 model. The first thing that happened was that one of the shafts was jammed in the coupler. Apparently the PO had run aground which slightly twisted the shaft inside the coupler. That was an extra 4 or 5 hours of labor. The mechanic almost quit over this issue so the yard manager was mad at me and my boat. I'm sure that I paid for him to get un mad. Second thing was that the old packing glands had worn small grooves in the shafts so they had to cut the fiberglass shaft tubs to get a smooth area where the seal would be. Another 8 hours extra labor. It was in a good but expensive yard so the bill was about twice what they estimated on the front end. Good luck RC 42' Nordic Tug Punta Gorda, FL **************Download the AOL Classifieds Toolbar for local deals at your fingertips. (http://toolbar.aol.com/aolclassifieds/download.html?ncid=emlcntusdown00000004)