I saw this last night too and it was magical on so many levels. I've been obsessed with the score for years but never had the chance to see it, so I had pretty high expectations, but it was everything I could have ever hoped for.
The cast were all amazing, and the sound was phenomenal with the full orchestra and that was huge choir who did a beautiful job. I Heard Someone Crying gave me so many chills. And it was so awesome to also see and hear the audience reaction, there was so much appreciation there last night, many applause just wouldn't die down and during the curtain call (they didn't rehearse this though, did they? Haha, nobody knew where to go) it was just wave after wave of love flooding towards the stage.
Special moments were also DaisyEagan's first entrance as Martha, her first line being "Hello, Mary Lennox", and as others have already pointed out, "Hold On" when she had her moment and got totally chocked up.
I loved Sierra, it was so great to see her use her fantastic legit soprano (I've only seen her live in It Shoulda Been You & School of Rock). Sydney Lucas did a fantastic job. I personally loved Cheyenne Jackson (though I was a bit too far away to really judge acting, mainly going of his voice) and am a little conflicted about Ramin. He had some beautiful moments but also some where I didn't quite like his voice, esp compared to Mandi Patinkin. Didn't love Ben Platt as Dickon for some reason...
However this is all nitpicking on a very high level, I had the best time, this is definitely going down as one of my favorite nights of theater.
I do hope it will go to Broadway, it hasn't been done so I think it's time and just going of the fact that they did 2 production this year, and both very successful, there seems to be demand for it. Of course the sound wouldn't be nearly as magnificent as last night, but the score is wonderful regardless and I would also be really interested to see what they would do with set design. There are so many more opportunities now than 1991.