It's normally the aggressive types that are more emotional pussies than the guys who keep their cool. I too worried about roid rage but the way I describe it to people is that I get a positive aggression. It's like a rush of zest that invigorates me. I want to walk into the gym, punch the biggest guy there right in the nose, spot him for a set of heavy bench presses and buy him a beer.
That's just me though. If you can't be reserved enough not to rage when you're sober and abstinent from all drugs, the last thing you want to do is increase your androgen levels dozens of times over baseline. If you're not man enough and responsible enough to behave, you shouldn't think that you're ready for steroids. They're otherwise not much of a big deal.
I've been on for a while now and I feel great. I want to ding out douche bag phaggots in real life from time to time, but that doesn't mean that I'm going to. I'm just the bigger man until another person takes a swing, then it's fair game.