I saw it this past weekend and thought it was fascinating and beautiful. I had several small technical criticisms of the writing and direction, but overall I found it really moving and creative. I should say that I'm partly biased in that I love when plays/movies/musicals/etc. where time is represented non-literally for emotional effect, and also where they deal with multiple generations, family history/legacy, etc. And this play tics those boxes.
In any given "scene," there are actually 3 scenes happening simultaneously onstage, each of which takes place in a different decade and centers on a different character. So we're essentially following 3 different protagonists, and we see their stories progress and unfold at the same time. The dialogue is written in such a way that sometimes the separate scenes kind of echo each other, or respond to each other, or sometimes clash against each other. So the play does require the audience to put in some real effort into following what's happening, and even then you won't be able to catch every word. But I think the playwright and director do a good job of timing it in such a way that all the important information can be heard without competition.
Personally, I thought the payoff was worth the effort, but others might disagree. The person I saw it with didn't care for the show for that reason.