We've tried them all and unfortunately none of them are ready for prime time. Rocket chat and Mattermost are the ones I'm the most looking forward to, looks like they should be ready in a few months. HipChat Server looks ready but it's not, way too many problems they're not willing to address for whatever reasons.

Did you document your issues somewhere publicly? (blog post?) A good comparison of the options would be interesting to have, since the topic seems to come up quite often.

I haven't but it's a good idea.