These drift socks do what they are suppose to do. It is a little difficult to use behind the boat when trolling due to the prop. The material will tear and rip on the prop for sure. Hanging them from the sides of the boat isn't nearly as effective as the back. I have a 267 Chapparrel and it takes at least two or three of the largest drift socks to maintain 1-1.5 mph. With that said they do work and if you need em you need em.