OK, they're not responding via e-mail, maybe this will get some visibility.
I paid for an item on all4btc thursday night and paid right away. The payment went through, but it still hasn't been fulfilled. The service fee on my item is around $150 US (it's a BTC3 item). It's been three days. You need to have better response time. Not cool.
They finally responded four days later, asking for the invoice, and after another day, claimed that:
we got your order adn tried it to order directly but it was not possible, because our paypal account did not allow the payment (sometimes this happens...)
We will try it again. Your payment arrived and is fixed in euro, so don´t worry about the falling exchange rate

It has now been a week. I've messaged them again, with no response for three days. Not professional, guys.