It's not perfect. None of the client programs I've found deliver all of its functionality. It fails to let me upload images sometimes, with no discernible pattern. The twitter gateway on rpgtable.com isn't working. My avatar image is grainy and I can't figure out why. It low-res'd it for some reason.
Ceejbot's mastodon instance. This is an overprovisioned, personally-run instance running on AWS. I welcome friends to create accounts here. I intend to run it as long as people are using it.