As everybody else have said. This add-on does what it says. I've seen my members amazed and felt happy by how things that can be embedded are by default embedded on their posts. Be it a pastebin snippet, a tweet on Twitter, or even a poll widget. Support from the author is also great. You can expect quick bug fix and continuous update. Totally recommended to install if you think that it's too much of a hassle to manually add more media sites to your XenForo installation.