I saw the show on Thursday night and enjoyed it for the most part. The show has a very strong book and the lyrics are often quite funny. The actual music is less successful, imo. Ernest's big number in Act Two gave me "Music Man"/Harold Hill patter song vibes, and as good as Seiber is, the song was a let down for me. (The puppet props in the scene also didn't really make any sense to me as well). The "For the Gaze" number and the final duet between the female leads are the two best numbers of the evening right now.
The first act is stronger, but I actually liked that they changed the final scene in the cemetery, as compared to the film (which didn't really work for me) and how it ties how "Mad" and "Hel" realize they have always been, in their own insecurities, more similar than dissimilar through all their ups and down.
Hilty and Simard seem to be having the time of their lives; Sieber cannily let's the ladies camp it up and then seizes his big moments with scene stealing stealth. Sadly, Michelle Williams (while looking glamourous and having a pleasing voice) is, quite frankly, the biggest downfall of the show. I was honestly shocked at how anemic her performance was; this is a character who, let's face it, is as self delusional as Madeline and Helen and needs to command the stage in the short time she's there at the center of it; instead we are getting a community theater level acting turn in a Broadway bound production. And I concur that Josh Lamon's character needs to be written into the second act of the show, even if briefly, rather than just abruptly vanish.
I also didn't love some of the costuming in the show. William's opening outfit is a sparkly concoction that she can't move in. Hilty and Simard are in stiff gowns in the second act which make no sense and are from some totally other era, in addition to make the characters seem not only older (after they've taken this youthful potion!) but heavier. Terrible fabric choices.
All in all, though, I found more to enjoy about the show than MANY of the recent movie to musical adaptions we've encountered recently. It's vastly superior to shows like "Mrs. Doubtfire" and "Pretty Woman" and "Tootsie" already; hopefully they can continue to work on the show's kinks before heading to New York. As it is, it's currently more of an entertaining than great night at the theatre.
One quick addendum: the night I saw the show they had "open captioning" which I loved when I missed a few words in the overlapping lyrics, or couldn't hear something due to laughter. I've never seen those at a show before; not sure if that was just for that evening's performance, but I truly appreciated it.