Hi Egil,
As with Rachel, they have come up pretty clean from my search as well. Best advice, take advantage of the safe payment options they offer in completing a transaction with them.
Steiner's advice is pretty solid as well, you can be surprised what sort of results a Google search like that can bring up. Word of warning though, you always have to bare in mind that bad news travels 1000 times quicker than good news, so it's not unusual to find negatives reports about any business out weighing the positive when you go looking for them. So you have to use your smarts and while you can never ignore any bad feedback outright completely, you do have to keep it in perspective.