We got a rash of reviews from Home Depot. Here are a few.
All 5 stars

June 9
This was such an easy solution to keeping frogs out of the plumbing. Very study and easy to install. Great product!!

June 9
Easy to install heavy duty

Sept 21
Had the large and 3 small Critter Quitter Plumbing Vent covers put on over the PVC lead covered vents on my roof by a roofer. It was done in the course of replacing the chimney cap, spark arrester and additional wind shield fabricated by the roofing company. They went on easily and have a better aesthetic than the lead cover alone. My fear is that the darn squirrels will chew on the Critter Quitter, too, because they have chewed on the plastic pop-up for the french drain in the backyard.