I wouldnt recommend any ebay purchases.
theres some incidents where most people buy specific miners, and they end up getting a usb stick instead w. a delivery confirmation.
Which forces more stress to call in ebay rep for dispute, and if you dont have enough proof you lose or the case closes.
eg: You were promised 2 units, instead you only got 1
That's an obvious exaggeration...
What you said applies to all online purchases not just ebay.
There are great deals to be made on ebay.