I need a prop protector for my 15 hp Honda which I run on a river with lots of cobbles and boulders. Anybody use them or have any suggestions? I've seen the Rock Hopper from Cabelas and it looks like the best one to me. Since I have a small boat and motor I am somewhat concerned about performance loss, but not so much that I want to buy several props a season. Please let me know what you guys think. Thank you!<br /><br />Tom