I bought a Plantronics Bluetooth headset from eCost. It was advertised as new, and it looked like a good deal. When I received it, it was not in its original packaging. It was in a little bubble envelope, with only 1 ear bud (instead of a set), with a power cord that had been rewound, and with incomplete documentation. In fact, their effort at providing a user guide was only a few pages on a photocopied sheet of paper. After calling the manufacturer and verifying they never send out product in this condition, and there was no such thing as an OEM for this product, I realized I had been taken advantage of. I called eCost, and they were extremely customer unfriendly. I told them it wasn't in as-new condition, I verified with the manufacturer this wasn't new, and what was missing. Only after I insisted multiple times for a return did she say to email the details and someone would get back to me within 3 business days. No one did. I emailed again. Nothing.

Fortunately, credit card companies have a dispute process, which I did. What happened? Vintage eCost. They only credited part of the transaction, which my credit card company told me they weren't supposed to do.
Avoid these guys like the worst communicable disease known to man. Unless you enjoy receiving products advertised as new that isn't.