I've had dealings with this seller too.
I bought a bvision card from him (at an admittedly bargain price) and paid the huge sum of 34 euros for delivery to Australia.
After 5 weeks, and 2 emails (one in his native German in case he didn't understand the first one) I lodged a complaint with ebay.
The card finally showed up after 2 and a bit months. I left him negative feedback for not answering my reasonable requests for delivery details, and he left me a negative for worrying I'd lost my money !!!
This from someone who is a prominent member of Amiga.org, and moderator of a forum in his native Germany. Who can you trust ?