I saw it last night, and was blown away by most of the show. Ben Platt really carried the show flawlessly. He was offstage for just a couple of minutes in the entire 2½ hours, and his delivery, characterization and singing were spotless. What starts out as a very funny comedy, smoothly moves into the serious sections through well designed dialogue and music. There was none of the 'let's say something -- stop -- and now we'll sing about it'. The music and the script twined very well. The show is original -- this one is not from any novel, short story movie or tv show that I can think of. There are some similarities with Next to Normal, in the characters of the grieving parents and sister, but the reasons for their grief are somewhat different. [I am trying to avoid filing this with spoilers, because there are a couple of good surprise elements in the script]. Yes, there are weaknesses in the book, especially in the very ending. But last night was the very first public performance of the show, and since it's in DC for six weeks, I have the feeling that there will be changes, additions, and subtractions during this time period. I haven't been going to the "premiere" performances in many years, but I am really happy that I saw this last night! The audience really loved the show. I am sure that a good portion of last night's house was of the family and fiends variety, but where I was sitting it was filled with regular DC theatre patrons who truly liked the show. They only staged a single company bow, but the audience, standing of course, kept clapping for a good three minutes until the company came back out,bowed, and just moved back a little to give Platt the solo bow he definitely deserved.