Saw it today and we had a lovely time. Possible slight spoilers follow... The costuming is striking in some instances and the battle with the tree monster was quite entertaining (I'd guess they made some cuts there, as it was only two or three minutes and then the prince fights an offstage dragon to further prove his bravery).
I don't have anything to compare it to, but it didn't feel overly political and there were no "edgy" current event jokes, which I find quite off putting most of the time. Plot-wise in terms of the whole revolutionary arc, Jean Michel catches Cinderella's ear with his talk of corruption in the palace, so at the ball she tells the prince of all the injustice and he's surprised by it. Later, she organizes a meeting for Jean Michel and some townspeople to talk to the prince and Jean Michel needs a lot of prompting from Ella to remember what he wanted to say.
To me, at least, it seemed like Jean Michel wasn't the one who changed the kingdom, he was the one with the idea and Ella is the one who had the chutzpah to make it happen. Which was good, because in a show called Cinderella you want to root for her, not a supporting character.

Also, there wasn't really a "upper class is all jerks" theme; it was more "the prince's advisor is a jerk," which is a theme that seems much more fitting for a fairy tale than what was described for the first previews.
Of course, as others have been saying, Laura Osnes is a gem who really shines as a triple threat in this role and Santino Fontana's dopey prince was somehow both appealing and believable as someone who was genuinely surprised to find out the state of his kingdom. Victoria Clark is wonderful, but -- and it feels very odd to say this given Clark's immense talent -- Osnes outshines her in most of their scenes together.
It ran about 2 and a half hours, including intermission. Some kids were getting antsy but for the most part the audience seemed to enjoy it and I did as well