Chad Callihan hits an annoyance:
I tried to run a new query for a CMS but the query window opened as disconnected. If I selected one server out of the group and tried to open a new query, I received an error that “A connection was successfully established with the server, but then an error occurred during the login process.”
That can get really annoying if you have a few hundred instances in your Central Management Server. They’d all go away if you set up certificates for the servers, but until then, it would be a major annoyance.