I don't understand the previous review that complained about branding. I'm currently using a trial version of the community option in which I have managed to customise every aspect of the chat room including removing any minnit branding by using CSS to hide these.
I've used a lot of chat software starting with IRC web clients to Parachat(now defunct), mibbit and RumbleTalk and installed the once popular eshare expressions java server at work and nothing comes close to the level of customization mibbit gives website admins not to mention how efficient, robust and blazingly fast it is.