I love it, but when it fails at scale, it can be hard to reason about. Or at least that was the case when I was using it a few years back. Still keen to try it again and see what's changed. I haven't run it since bluestore was released.
Yeah, I've been running a small Ceph cluster at home, and my only real issue with it is the relative scarcity of good conceptual documentation.
I personally learned about Ceph from a coworker and fellow distributed systems geek who's a big fan of the design. So I kind of absorbed a lot of the concepts before I ever actually started using it. There have been quite a few times where I look at a command or config parameter, and think, "oh, I know what that's probably doing under the hood"... but when I try to actually check that assumption, the documentation is missing, or sparse, or outdated, or I have to "read between the lines" of a bunch of different pages to understand what's really happening.
