Andrew - 17 Years and No Problem!
Also, for installation, make sure the taper is the proper one for the prop and that the keyway is also proper. If the key is too thick then the prop will be off-center and there will be vibration.Advantages:Boat goes significantly faster, tracks higher, you'll sail more and motor less, and since the shaft doesn't turn there won't be any additional wear and tear on the transmission, and.. (there's more?), the boat sails quieter! (no swishing prop/water noise)