Saw it tonight.
To start, haterobics, yes I would recommend watching the movie first. I was glad I did, it doesn't spoil anything, as this is a sequel, but there are a lot of references to it that would add a layer of confusion to the show for you that is unnecessary.
At the end of the day, I enjoyed it but felt it didn't reach it's full potential. There was some really, really good stuff and some stuff that just didn't work for me. I wish that I could see it again later in the run to see if they make any changes.
A couple of my personal thoughts:
The cast overall is strong. As others have mentioned, Sophia Anne Caruso is a star. What a voice that girl has. I hope they make a cast recording if only to hear her singing those songs again.
I have to say that I found Esper's character to be one of the most interesting, and his big number was one of my favorite parts of the show.
The music is fantastic. Not being a real follower of Bowie, I couldn't begin to tell you what the ratio of old/new music was. There were, I think, 4 times where I was like "Oh yeah, I know this song."
The videos and projections are really well used, and really pretty cool. They add a level of surrealism that is essential to the piece.
I thought the script was one of the weaker points, sadly. I loved Enda Walsh's work on "Once" but here I felt it wasn't reaching the heights (or depth) that it could/should.
The three "Teenage Girl" characters just didn't work for me. I didn't really understand what they were and, honestly, they felt amateurish to me. I'm not completely sure how to explain that, but even just their costumes, every time they were on they looked to me like they had wandered into NYTW from a community theatre production of I'm not sure what.
The other thing that stuck out to me was the direction. There were just times throughout it that seemed very sloppy and not in an "under-rehearsed" way.
I'll be curious to hear if they make any changes during previews, and I think I might try to lottery when they start doing it, in hopes of seeing it again. Overall I enjoyed it and am glad I saw it.