I just caught this production for the first time on Tuesday.
Having played the Stage Manager, this show (and that role) are very, very close to me. I was astonished--a word I don't use all that often. Cromer's work (and that of his actors) is beautiful: poignant without being heavy-handed.
Helen Hunt, I thought, was good, but by no means the center of attention; in fact, the evening (in my opinion) belonged to Emily, rather than the Stage Manager.
Anyway, if you haven't seen this yet, go. You will regret having missed it once it's gone.
"We don't value the lily less for not being made of flint and built to last. Life's bounty is in it's flow, later is too late. Where is the song when it's been sung, the dance when it's been danced? It's only we humans who want to own the future too."
- Tom Stoppard, Shipwreck