I'll chime in here and add that I was burnt by user 5810 to the tune of ~$550 USD.  Two separate transactions and paypal closed one case almost immediately despite the initial notification stating that I had 7 days to respond.  There was no explanation or note of any kind in the case.

I'm a long time member of paypal in good standing, not that I *really* expected them to take that into account.

The second case is still open and I posted any/all supporting evidence, such that I had.  If I do get any serious response I'll update here.