Is kakao-karten.de Safe?

Has alot of great helpful threads in the forum about all sorts of art materials to use (or not) for ACEO cards or drawing in general. No matter if you are a newbie or a pro to ACEO cards, you can have an account and trade or sell cards with other members. Most members there are friendly, but expect to get your ass whoped, if you start to senselessly nag and whimper all of the time. The site is completely in German language.