We have a PYI Packless Shaft Seal, or "dripless" shaft seal, which has been great for many years. What we have found out, however, is that when it goes, it really creates a flood into the boat. The word in Spanish for flood is "inundacion" and that's what we had a couple of weeks ago. We found out about it 15 minutes away from the dock, thank goodness - because our automatic float switch for the bilge pump also decided to give way at that point too. We have an Ultimate Pump Switch, which has given great service for many years, but is now also kaput. After much footwork and investigation we have figured out how to get spares for both, and are having them shipped. Our simple haulout has turned into more of a project, with a shaft seal to replace, and also our engine motor mounts, which the mechanic strongly recommended.