I need to know some information on prop guards. I work at a marine and one of our customers are interested in a prop guard. The only thing that I know is I seen pictures of them and that is it. I guess the biggest 2 questions.<br /> Do they really work or is it a waste of money?<br /><br /> Do they effect the performance of your boat and how? Them are the only questions I have and hopefully someone out there has one of these or knows someone who does that can help me.<br /><br />Thank you for your help!<br /> Nick