Found it very jumpy and really missed the detail you get in the books.
Also a lot of the stage directions are nothing like an actual stage direction, which I thought made it really clunky to read, like it's trying and failing to be a book. The stage directions appear to try and convey the detail and drama and emotion JKR is so good at. Thought it was a really disappointing read.
I liked the story but I'd be very interested to see how they manage the constant changes of scene on stage (presumably some sort of projected stage scenery?) as it does go from one to another very quickly and for very short periods of time.