Hana Kimi was one of the first manga I read (maybe it was the first? haha) and I loved it loved it loved it. I finished the whole series, but I promise I won't spoil it for you. ;] I especially loved Mizuki's weird relationship with Umeda-sensei, but I seriously didn't catch that Sano knew that she was a girl until halfway through the entire series.. It wasn't as obvious in the manga.
The Taiwanese drama is eh.. I'm enduring it, hehe. I wouldn't say that it's the best manga to Live Action adaptation. I bet Japan will come out with their own version in a few years. (Just like what they did in Hana Yori Dango to go against Meteor Garden.. I really thought Meteor Garden was really boring, sorry.)
The TW version is bearable. It helps that the actor for Sano is unbelievably adorable, hehehe. ^^; Yes, I'm guilty of continuing to watch a series if there's at least a couple of bishies to keep my eyes on the screen. Sano did figure out that she was a girl from the start which wasn't as subtle as the manga.
Some of the things that happen in the Live Action are kinda weird and acted really badly.. And the actor for Umeda-sensei is no good! He makes me want to cry. >_<;
If Japan comes out with their own version, I'll definitely watch it. :]