It's not the language that makes this play what it is and what it isn't. There is emotion missing in the cleverness of the dialogue and the letters exchanged.
The temptation after the show to dance your way to the parking lot is inescapable. There is so much embedded into the performances that only a director with a vision could have brought to the work.
This is not a classic -- it soon will be, though -- that you've seen a hundred times before; this is a new play with a definite future. This is a rare chance to be in on the first stage of that journey.