I bought my first Protank mini on eBay, as well as Ekowool, batteries, and Kanthal. Never had a problem. Typically Ebay finds in the favor of the buyer if something goes wrong... I'd be more concerned about selling than buying there. Also if you use PayPal, you have a second protection there. And a third if you purchase using a credit card through PayPal... if both eBay and PayPal fail you, you can do a charge back with your credit card company.