I think I've always had explosive rage (punching walls to the point of breaking my knuckle, but hey, it keeps me from punching people unless they start it) but previously it took much longer to build up and much, much longer to die out. Now my "rage" dies out in a matter of minutes, literally, and then I'm back to being my nice and laid-back self.
I also second the better confidence. I was one of the shy, silent types but I'm suddenly much more confident to voice my opinions and stand up if I disagree. And all this in just 6 weeks of T so I don't know if it's actual effect or placebo effect, but either way it's working miracles.