I've been on T for a year and a half
Pros: No monthly hell, increased muscle mass, increased strength, tougher skin, deeper voice, facial hair, looking more masculine, losing weight, downstairs growth, darker and thicker body hair, more confidence, increased assertion ability, developing male friendships, being more congruent to myself and others.
Cons: Acne both face and body, although it's mostly under control now thanks to retina-A, increased anger, aggression and irritability issues, making others nervous without meaning too, not knowing my own strength, being out of sync to others guys I know due to lack of childhood conditioning, increased hunger