A possible added functionality for TinyMCE advanced would be the ability to create multiple editor versions.
For example, an admin could use one editor arrangement (and name it Admin Editor), and a simplified version could be used by a client when they're logged in (and call it Client Editor).
Also, depending on the section of the website, one editor arrangement would better fit the type of content required. This would work great with custom fields.
Still a great plugin!
Thanks!
Adam