It's generally easy enough for our church livestream volunteers to use. We livestream to Facebook and YouTube simultaneously and this makes that task easy.
I love how Castr allows us to simultaneously publish to multiple livestream platforms without tying up lots of upload bandwidth. It's mostly a set it and forget it experience because it just works. I also appreciate having a livestream recording backup on Castr in case our local recording fails, as I can easily download a full-resolution video file for on-demand or archival purposes. Their tech support is responsive and helpful, always resolving issues quickly and competently.