Ryan Miller has always had a reputation for being an emotional guy who says what he thinks (see: Lucic, Milan), so it's no shock that his last press conference in Buffalo is honest.
He's only played for the Sabres; it's understandable that tonight is bittersweet for him. This season did not work out as planned for anyone on that team, least of all Miller. Don't take this as him being upset to go to the Blues, however. This is a great opportunity for Miller to go on a long playoff run. It's what any goalie wants.