I have two orders in with them. have received half of one, and notifications when the other will be delivered. It is odd that you don't pay up front. I can only guess that this is because they are a foriegn organisation and they won't have to pay twice to exchange currencies if you pay, then they refund you.
Friend of mine uses them all the time quite happily, lots more on webiste that in shops.
I have just had a maternity cape coat delivered I ordered 3 weeks ago. Although I love the clothes, I would definitely say to find out if your local store does them as I found the delivery time disappointing, I don't need the coat with all this sun now! I ordered the leopard print scarf from Hong Kong, which arrived a week and a half earlier than the coat.
Was also surprised at just one standard delivery rate, much prefer ASOS and find their quality amazing. Much more choice as well and discount codes are always lying about.