Haven't used the RMAH yet. Gold's trading for about 4euro per million but items on the RMAH seem a little overpriced compared to their gold AH equivalents. I guess this makes sense as more people have real life gold than in game gold. Hence currently the people profiting off RMAH are those that were/are in game rich.

Worth pointing out that those in the UK will default to the £RMAH, which obviously has less items being traded on it than the Euro RMAH. You can switch between the two by switching currencies on the options menu.