tren will definately make you more irritable and agressive. I just finished running 100 mgs a day for 15 wks. After the first few weeks I got used to it and it stopped bothering me, but I could still be a pretty moody s.o.b.
Tren makes me want to punch everybody I meet/see in the face. Sometimes I forget I'm a big guy, so when people are always staring at me I'm ready to rip their heads off. Its nothing uncontrollable though, just an underlying tendency to want to smack everyone around. IMO the effects are definately worth the sides...they're pretty damn dramatic.