for a product that if you need to repair requires hauling the boat? It is more expensive and arguably not the right solution. What will you do when in the Bahamas, for example, and have an issue? I opted to go with the dripless packing and am very happy with the result, plus it can be fixed both cheaply and done anywhere if there is a problem in the future. I have always felt that the dripless shaft products are complicated solutions for problems that need not exist.