Picked up the manga 1, 3, 5, 6, 7 from my local book stores, ordered 2 and 4 online
2 arrived with a bent spine T_T
Preordered 8 and 9 english release
Was tempted to get 1-11 in Japanese, but decided to buy it in English when I saw most of it in store
Only read 1 so far, because I was waiting for 2 to arrive
The anime follows the manga pretty good - but the manga has some scenes the anime didn't have, which made it worth the read
The ganbare ganbare senpai part (video in first post) was much better in the anime though