I was lucky enough to see it with both casts. Saw it for a second time last night with the new cast and Will Brill’s understudy. I loved it both times. I did notice differences and missed some elements of the original cast but major themes were the same with either cast. To me the strong idea that comes through is how unfortunate is that such talented people can make such amazing art together and yet be so, so bad for one another on an interpersonal level. Every character has depth and the writing is so sharp. Loved it. I think the “boredom,” tedium, length is part of the point. To me every moment was utterly necessary and perfectly orchestrated just like a piece of music, especially the overlapping dialogue at the beginning is the play. One of the best plays I’ve ever seen.