Overall, I'm calmer on T -- I'm carrying less anger around, and I'm just happier and more open. But my doc warned me that "You'll likely be more even-tempered and slower to get angry, but when you do -- BAM!"
That's happened a couple of times in the past few weeks: I've just blown up over something. It seems to be partly that I'm more in touch with what I'm feeling, expressing it and not sitting on it all the time, and partly, I guess, directly T-related.
I get over it fast, though, apologize if necessary and move on. My doc also said, "This is basically puberty, and part of the process is learning to handle it."