Jens,
Thanks for your post. I'm an utter newbie to this forum, but not to scale modeling, and have had the same issue with el Presidente Decals that you had. I transmitted an order on 9/4/10 via PayPal and did not receive the MiG-17 decal sheet I'd ordered, with no response to two polite e-mail inquiries sent over the past week. Therefore, I opened a dispute resolution through PayPal and received an instantaneous automated reply from el Presidente that my order was canceled. So far, nothing else. Will keep you posted as to any refund.
Malan