I used it primarily for the bulk annotations. TubeBuddy requires you to pay to get bulk annotations (you can only do it for 1 video at a time), VidIQ does it for free for multiple videos, and I bulk upload so it makes it much easier for me to just copy the annotation from 1 video to multiple others, same for cards. I do use the tag system for some minor SEO research but that's minor, none of these plug ins really offer anything else of use to me so I only need VidIQ. I did use TubeBuddy at some point primarily cause it worked on Firefox, but I don't mind having to pop into chrome every once in a while just to copy some annotations for free. lol