Not self-hosting, but I have been using Anytype for a few months now and absolutely love it. I’m doing a lot of online coursework, and so I’m using Anytype to take and organize my notes actively for several hours a day, every day. I also use it for task tracking, journalling, and it has just generally become the place where I dump any kind of info I might need to retrieve in the future.
There is a learning curve before you get the hang of it. I was also frustrated by the editor at first, but now that I have learned some of the slash commands, added in with markdown formatting, I find it to be really efficient. One oddity that likely trips folks up is that every paragraph is a separate “block” which makes partially selecting text across blocks impossible. On the other hand though, it makes grabbing a block and repositioning or reformatting the contents super simple.
Keep in mind that Anytype is offline first, p2p for syncing, and end-to-end encrypted. So the value of self hosting is, I suppose, not using their provided (currently free) backup node? It doesn’t seem like a big deal to me unless you don’t trust the encryption.