I saw the show tonight and agree with all the superlatives already posted. What a powerful & brilliant show. Everyone is so strong in their roles, especially Joe Mantello and Ellen Barkin. Give them both the Tony right now!
Such a great show! If you have the opportunity to see the show, do it!
Act One runs about an hour, and then Act Two is longer at around 1h:15m. It ended at 10:30pm. It seemed like a pretty full house, though I couldn't see what the mezzanine was like.
"It's Phantom meets Hamlet... Phamlet!"