Awesome, this service is needed. I had the job of finding/implementing an outside-accessible group chat service for a startup. I wanted Campfire, but one of the founders didn't like newfangled web chat and required it be traditional IRC.
Setting up open source IRC servers is a pain. They are almost completely void of documentation. And as the article points out, IRC doesn't usually have the traditional username/passwords or access controls you really need for business group chat.
I realize this is an MVP. Here are somethings I think should be included:
* Groups. It makes it way easier to manage access controls.
* A way to invite outsiders. The specific use case is inviting customers to join a chat, without the customer taking up a user/license seat.
* You've probably done these but I can't tell from the website; persistent chat rooms and varying admin privileges (ops in some rooms, not others, ability to create rooms, etc.).
EDIT: Why was my comment down voted?