MAY CONTAIN SLIGHT SPOILERS!
Watched it two days ago at TOHO Cinema in Tokyo.
I remember that I was reading manga, but at that time it wasn't coming out frequently and scanlating wasn't going good either, that's why I read about 9 chapters, so I barely remember any events expect the beginning of the story and main characters. But I was waiting for anime adaptation since that time. Even though kinda hoped for series, not just a movie.
I must say that I was a little worried about it airing at the same time with Kimi no Na wa, but it still seems alright, box office going good,
even though it is three times less than Kimi no Na wa (but don't compare original movie made by Makoto Shinkai with manga adaptation, even from KyoAni).
But for the first half an hour (or maybe more) I was sitting quietly, being afraid to move even, cause it grasped me completely. I was feeling anger, pity, shame, a whole parade of emotions. Story felt good and dramatic, as Japanese like to do. Never ending and always sharp problems of bullying in school, attitude to people with disabilities who are trying to fit in the society.
Animation was great. This is what you should expect from Kyoto Animation. And don't try to compare it to Kimi no Na wa, it is really just on different level from the very beginning. And camera work! It was really incredible, I loved tons of shots, how they tried to accent on legs and lower parts of the body (I mean shots excluding characters' heads :D).
But as for characters and their development, movie had some problems. Both two main characters were shown great. But such a large amount of, probably, interesting supporting characters weren't developed good enough, even though the movie is more than 2 hours. Like Mashiba (red-haired guy in anime), for instance, he said just few phrases and felt really left out. And two ex-friends of Ishida from elementary school seem to have been forgotten at all, even though there were at least two scenes with them. And there were some shots that I didn't quite understand, like, for example, why Shouya's mom was bleeding and looked really beaten up, after she gave money to Shouko's mom? She beat her, really?
In general, I enjoyed it a lot, and can say that it's the second best movie by KyoAni (after Haruhi, obviously) and it is definitely worth watching. And I probably should finally read manga completely.