I too researched for about a year. I had the PVC guards (purchased at Lowes)with the roll & slits that let in one wasp nest that I know of and oak strings, and maple helicopters. I went with Leaf Relief to avoid these issues. Nearly 1 month and many storms & leaves later, still good. I'll report back in the spring and see how performance is with the oak & maple "stuff"
Moderated by Handyman 
