It's pretty good, but some elements it won't let me select. Also if I block a small element and it's one of those that disables the whole site when you block it, there's no way I see to undo that. So from there I either have to disable the extension for that site, or uninstall and reinstall it. That's annoying and inconvenient. The "custom rules" and "white list", I don't know how to use it, and it looks like something I'd rather not have to learn. The claim is that "ALL ads" are removed... "No acceptable ads"..."No whitelisted advertisers allowed". That's not the way it really works.
