As of July 2015, InvisaFlow Model Metal Lock-In Gutter Guard, FlexxPoint 5-inch Gutter Guards and Frost King Gutter Guard are highly-rated products. At Home Depot's website, InvisaFlow averages five stars on a five-star rating scale.
Reviewers say that InvisaFlow gutter guards are easy to install, sturdy and rust proof. FlexxPoint's guards average a 4.6-star rating at Amazon.com. Customers state that they are a good value, strong and protective against all kinds of foliage.
Frost King Plastic Gutter Guard has an average online rating of 4.5 stars at Lowes. Positive comments mention the guards are durable, effective in rainstorms and almost invisible.