I was there as well and really enjoyed it. This was my first exposure to The Real Thing and I think I absolutely must read it now since I am certain I missed things.
Each actor is turning in fine performances. McGregor certainly walks away with the meatiest part and he certainly milks it for all its worth. He has a certain magnetism about him yet also an underlying vulnerability that makes his portrayal of Henry incredibly authentic. It was also a real treat to see Cynthia Nixon as Charlotte, who steals every scene she is in with such wit and timing.
I do think Maggie Gyllenhaal needs a bit of time to settle into her role, as she seemed to struggle with her accent a bit and had a certain awkwardness about her delivery. That said, she's on the cusp of being on par with McGregor, which is certainly no easy feat. The play is tightly written and truly zips by in the careful hands of this talented cast. I'm not sure if the playing of music is as central to the original production or script, but opening each act with live music was a nice treat and enhanced the music motif.
I actually quite liked the set. Sure, it is Roundabout so you cannot except something big budget, but I thought it was perfect for the play. The lifting piece in the back that became the train windows was a nice touch as well.
This is a refreshingly smart play and it's well serviced by the cast and direction. I truly cannot think of any real complaints and it is shockingly top form for a first preview. I certainly recommend it.
Scratch and claw for every day you're worth!
Make them drag you screaming from life, keep dreaming
You'll live forever here on earth.