User blog comment:Mrlmm0605/Let's Talk Bleach! - Part 13: Bankai/@comment-11446176-20160418015621/@comment-26091912-20160418073027

Hyper-speed combat, enhanced/multidirectional controlled Getsuga Tensho, enhanced strength, being able to stay in Bankai for months.

Kenpachi's Bankai is just MAWWWR POWWA.