I am planning to put a line cutter on prop shaft this spring. Right now, based on feedback I have received on this board, I am leaning towards the Shaft Shark which has a serrated edge. In looking around the boat yard, I also see some line cutters which has a smooth edge (like the PropProtector) - that seems like it could be easier to sharpen each spring by using a sharpening stone. I would be interested in any other feedback anyone may have before I order mine. I sail in the Northeast where 2 out of the last 3 years I have fouled my prop on lobster trap lines with my fin keel and spade rudder.