I've been using this. I got my brother to sign up for an account and created a new char myself. For the times that he couldn't be bothered to play I'd just park his char in a quest hub type town and then when I received the quest reward I'd be within range of his char and I'd receive triple xp for the q reward. It's taken me 8 days to get from level 1-60, and I can't even claim that I played that much.