Since this is a music-based anime, the music of Togenashi Togeari (the band that the girls are forming) is powerful J-rock. If you are a fan of the genre, you'll be pleased to know that the band has already released 10 very good songs before the anime starts. The opening (which visuals start with great 2D versions of the cast leading to the 3D versions) and the ending are performed by the band as well. Regarding the voice cast, all the actresses are new, and this is especially noticeable in Subaru's voice, but it makes the character's conversations more realistic and "normal". As a curiosity, the voice actresses are the actual members of the band Togenashi Togeari, who play their instruments live, like some Bang Dream bands do.
The CGI in the show is well executed. Despite some minor details (for example, the texture of Momoka's cat is a bit weird), the show fully embraces the medium and uses it creatively, especially in the two performances shown. The facial expressions of the main cast are very expressive, giving a good amount of movement to the mouth and adding little movements to the characters that seem to move like real people. This may seem a little strange to some people, and the whole CGI aesthetic might alienate some others, but you have to give it a chance. It's not just acceptable CGI; it's actually good CGI and good animation.
One of the big problems of the show is that it is not available legally at the moment in the West, so the subtitles are an issue, and not being licensed on any major platform may cause the show to go under the radar of many people. This has the potential to be one of the best musical shows of the year, and it deserves to be seen.
