I finally saw it as well! SaeYuki version, of course
It took me a while to get into it. The Aitakatta performance at the beginning didn't really help to create an exiting atmosphere. Especially at first the setting was kinda bland too. In some cases, a clean setting works really well, for example when Yuki was in bed. The lighting was really well done imo.
Let's start with the supporting cast. It's cool to see that they used some new girls and underdogs to participate in this project. Having said that, I feel that Natsuki and Nakatsuka are a bit of a mis-match. Maybe it's the age difference, but I wasn't really feeling them. They did their best, so it's probably just me. I also feel that Katayama and Chisato got shafted a bit. Sure, they were there, but they did not get to say or do that much. Some of the girls truly impressed me. In particular Wasamin. She's pretty young but her acting, as well as her vocals were great. The second girl who deserves special props is Nakayan. She made her way back info my fandom. Great vocals. Speaking of great vocals, that one guy from the professional actors has an amazing voice!
In all honesty, as non-biased as I can be, Yuki owned the musical. I was a bit worried about whether she could act at all, because she kinda failed at it when she did that seiyuu work on Nemousu. She pulled it off very well. Granted, her role is probably less challenging than Sae's, but I still believed her. I absolutely love Yuki's vocals. Some songs suited her better than others, but overall she was great. Especially the ballad after Kimi wa Pegasus was amazing. I also dug 'Yuki Bell ga Naru' at the end.
I can give Sae nothing but props. It must be incredibly hard to pull of solo versions of Blue Rose and Maria, but she stood her ground. the highlight was when she sang Kimi wa Pegasus. I could heel her pain, she really gave it her all during that performance. epic.
Speaking of the songs, I really liked some of the transitions between the acting and the songs. For example the way they went straight into Blue Rose was nicely done. On the other hand, some of the songs kinda ruined the mood, but I guess a musical must have a mix between various types of songs.
I can't really think of a good ending sentence, but it is definitely worth a watch.
edit: I'm curious about the Sayaka/Takamina version. I think Sayaka must be awesome in the solo versions of these songs and I wonder if Takamina can look as typically girly as Yuki did...