The art of the main series is well done with the girls being very cute and are all modeled differently, which is important for such a big cast. In the beginning the dance scenes are a bit of a problem since they're bad enough to feel like carcinogens, but that is fixed later in the show. The dance scenes are actually held in virtual reality in the show and when past recordings of dances are shown on screen they have the same animation as when they were first shown so it may be that their own technology is improving making the bad dance scenes slightly more forgivable. The dances at the end have better CGI than pretty much any other anime I've seen.
The music in this show is amazing. There is a total of over 70 songs and although there are both hits and misses the hits are amazing and many are top ten worthy, although partly due to the lack of insert songs in most anime. The voices were all outstanding. Oddly enough, the age gap between the seiyuu for the two protagonists is about the same as for their characters but in the opposite direction. All of the seiyuu do a good job and the ones who speak other languages add a bit of spice to the atmosphere. One character develops an even more cringe worthy version of Engrish, which is interesting to watch.
With such a huge cast it's amazing that they gave every character an interesting and unique personality. There are even some characters who end up in the main cast who you wouldn't expect to because of their eccentric personality traits. The anime is about the characters and they all do a great job at making the anime fun to watch. There are sure to be some characters you won't like, but you can only hope that those characters won't get as much screen time. It's great to see the different characters from different places as they will often use this as a method for world development.
With everything this anime does well it is incredibly enjoyable. As a kids show they try to decrease the character-viewer disconnect so anything the characters view as being good actually is good. There are some foods in the anime that just make you want to try them and some did have a limited availability in real life but none are available outside of Japan. Just like with anything it's more important who you're with than what you're doing so although this is just a really good rendition of a generic story the great characters and great music make it far better.
With every considered this is a great anime that does not disappoint. There are still some questions unanswered, but they did a better job addressing the most probable questions than most anime do. Anime with futuristic settings are bound to have holes in their logic but this one does fit quite neatly. Whether if you like cute girls doing cute things, music anime, or even sports anime depending on your reason for doing so this should be a good anime to watch. As an original anime you don't have to worry about which episodes are filler even though the anime is on the longer side.
