Great sideline view. Even from the upper deck, you still feel fairly in touch with the game and not completely disconnected. 320 is easily one of the better seating selections up there, just stay away from the corners and try not to watch the game on the jumbo tron. You can watch Senators games on big screens at home for free.
To give you an idea what the view of the ice is like from section 320, here is a Youtube video shot from row F during a Senators/New York Rangers game.
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