I saw this show last week and had quite a visceral reaction to it. I was extremely moved by it and, leaving the theatre, I ended up walking around Central Park for a bit afterwards to calm my emotions. I thought the writing was an excellent mesh of very human characters who I was emotionally invested in and very interesting ideas - and, the discussion of these ideas never felt forced and always felt motivated from the story.
And, whew, all four of those actors are giving spectacular performances! I had no trouble following the different stories and and I felt the actors excelled at not exaggerating differences between each of their characters, but rather, were able to subtly change the presence each of their characters presented. I thought Carr would be the stand-out for me (and she is giving a great performance), but Heather Lind and Charlie Cox were simply excellent in their roles. They are both new to me and I look forward to seeing their future stage work!
I've never seen a performance of any other of Payne's work, although I did read "Constellations" (which I thought was interesting, but didn't really grab me beyond that). I was surprised how much I took to this show and am extremely glad I decided to pick up a ticket.