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I don't have to manage it at our company, so from a user perspective it's good enough.

Sure, there are some issues once in a while. Like with everything.

We use rocket chat in uni to communicate with team members for project, I think it is good enough for this purpose.

I managed RocketChat. It was pretty easy, but we weren't stressing it.

I do manage an instance of rocket.chat, and I am no longer a fan.

rocket.chat is open core, please avoid it

Can you elaborate on this? I am currently using RocketChat and would interested to hear of security issues or similar problems it has.