Was also at the final dress last night. Rylance is incredible, rest of the ensemble very strong as well. Really impressed by Mackenzie Crook.
I feel like the play might have trouble in the States because (even as someone who liked it) I don't know/care all that much about St. George's Day or the English countryside. I would guess those things hold more meaning to a British audience.
I'd still say go. Yes, it's long, but I find parts of it totally fascinating and love the bits of magic he throws in.
Some people paint, some people sew, I meddle.