Did Sub-Zero's tower and got similar stuff.Kung Lao's character towers, gave me a skin, chibi avatar, intro and taunt for finishing all of them, on top on the stuf for doing each. Really nice.
Honestly the Character Towers are fun as hell and are the right difficulty for most things. Even finishing them all gives you the character's tower ending. With that in mind there's really no reason for me to do Klassic Tower as it's a "Super Klassic Tower" with 5 different sections rather than 1.