Works exactly as advertised, makes it easy to block clickbait channels that pop up in your recommended. Why isn't this just a feature of YouTube normally? I swear...

One thing that is a BIT confusing is when you end up on a video or channel you've blocked (for example if you click on a link to one), it doesn't tell you that you blocked it or try to stop you in any way, it just stops the video from automatically playing, meaning you need to click to start it manually. It's pretty obvious once you know how it works, but it's a tiny bit unintuitive, and you might not even realize that's what's happening at first. Would be nice if there was a message like "you've blocked this (channel/video), are you sure you want to proceed?" or something.