Yeah.. Don't sell on ebay or amazon. People WILL scam you.
I just had an ahole last month buy my last S7-B6, recieve is, show it working, then next day start a claim to return for full refund.
THe dckhead fried one of the boards as he tried ot run the miner at 700MH vs 600-620max and improperly hooking it up.
Paypal effed me by giving him his money AND shipping costs back. Now I'm stuck with a 66% hashing S7.
BTW the bastard guy's name is/was : BRIAN SURGUY in Annapolis, MD..
On here, I've had mostly good dealings (other than people trying to lowball you or disappear after making a deal)ALWAYS USE A FORUM ESCROW.