I did have a good experience going through a Euro dealer.
If the piece you are looking at has a dealer that would be the middleman, then that could be worthwhile for the protection.
In my case the dealer was taking a piece on upgrade, and they responded to an email I had sent to them months before.
Same here i have not had any problems yet .
But i meet first face to face usually before i make a transaction.
And collect the item myself .
Just to be more safe
I have made many purchases trough Audiomarkt, but try to pick up and inspect when i buy expensive items. A lot of scams, often by new members with no rating.
Upon reflection, one of the scams was on an Asian website.
Using “Google Images”, I was able to find the original photos were copied from another place.
That was a bit of a red flag.