eBay has a complaint for item not as described. File your complaint. The seller has a certain number of days to reply. Read the dispute guidelines. I've gotten money back before on bad items.
http://resolutioncenter.ebay.com/Click on: "I received an item that does not match the seller's description."
. Ebay's not really nice to people, when it comes to complaints.
I've never had an issue, if its used correctly. I've had disputes in the past, went through their system, everything worked out fine.