I'm recently completed to read the manga, I'm pretty happy overall, but there are a bunch of chapters including the last with the two sisters doing things after the main story, that are very flat and filler-like. Some central chapters, for example the baseball guy, the human plane and other chapters like those are unnecessary. After seya, it becomes annoying reading the same old gto formula coming back with another problematic child. Onizuka seems like a childish superhero. But the final arc with the shonan mayor it was very good, the manga rise up from the return of kanzaki and Kikuchi to the end of the mainstory.
I love the introspective dialogues.

And i love Uchiyamada misadventures ahaha.

In the and it was a good reading but some parts were very very difficult to read.