We love them!
We had to trim one of the sides to have it fit in our gutter, but it works wonderfully. We actually get a lot of water output now compared to our tiny hole that we were trying to use before. My husband put a ring of caulk around the opening to act as a gasket to keep the water from going underneath the plate and out the hole that way. Otherwise, you'd have the water coming out at a weird angle and missing the rain barrel completely. It looks like it will hold up for a long time.
Easy to install and works great!