User blog comment:Imrlybord7/An announcement to all admins and rollbacks/@comment-1373755-20100321191727

@daniel, basically it lets you undo multiple edits from a single user very quickly. Just click the button and any recent revisions from that user are instantly reverted to the last user to edit the article without having to go to the edit page. Basically it's a very quick way to undo multiple vandalism edits.