Just started reading this manga and now I'm up to volume 27. I really like the relationships and the flow of the characters. It doesn't stress to much on one thing (like Yamato's boxing).
And I know that this sounds odd but I seriously hope Mogami and Yamato DON'T end up together. I think they make a crappy couple ;P
My favorite is Aoba though she's only been in the past few chapters.