User blog comment:Kaestal/What is your favorite/least favorite Bankai?/@comment-11446176-20160405090258

Zanka no Tachi hands down, for its sheer power.

And despite its power, the fact that he can't use it 24/7 not because he doesn't have the strength/control, but because using it has an effect on his allies as well, which, all things considered, is a rather smart way of stopping a character from over using his powers, and not something done all too often.