It has been mentioned before that we want people to use their companions without penalty. They do not steal your xp when they kill. Consider them your mutant third-arm (you even get the kill cam shots if they finish off the last enemy in an encounter).
Is there anything you guys DIDN'T think of?
It seems like Obsidian has gazed into the hearts and minds of every Fallout 3 fan and fixed all the small hangups about the gameplay, then took the story/setting/atmosphere in a direction (I hope) old school Fallout fans can appreciate more.YAY