Hi Guy,
I don't think I can tell you too much, because I don't know about the euro hidden bidder auctions. I've placed bids in auctions in many parts of the world, but have never noticed having to apply to a different system. Maybe that has to do with how I place my bids. I've never had a particular problem either buying or selling overseas -- a few quirky money transfer snafus yes, but good communication and follow-through has kept it all good.
And I've never really had to deal with customs. I think that is because my transactions are so low value, they fly 'under the radar' of customs authorities. For a while I was getting air shipments from a fellow in India, but by keeping our shipments under $2,000 (I think it was), we avoided any customs charges.
After being on eBay for a while, and losing some auctions because of the trouble of bidding and counter bidding, I learned about sniping services and signed up (to snipeswipe.com). Now, it's the only way I ever bid. It's so much more convenient to just decide what my real final bid is, put it in with the sniping service, and then not worry about it. In addition to the convenience, it reduces the chances of someone else bidding specifically against me, or increasing their bid because I've shown them that I value the product more than they originally did. Who needs bidding wars really?
Well, sorry, I don't think I've really answered your question, but hope that my rambling has given a few clues to my perspective ... for what it's worth...
🙂
Rick Knowlton