I have purchased a lot from Amazon Canada & USA mostly general merchandise very little camera gear and never had a problem. Have had no experience with return policy with Amazon.
Have bought a lot of merchandise on ebay both new & used and with their return or refund policy I have never been burned. All photography gear has been as advertised so far and the price has been so low as Pathdoc says that I'm willing to take a chance.
I have had 6 refund requests in the last 4 months from China all honored. There is something going on with their shipping system in Mainland China right now so I am staying away from purchases there for a while. The disappointment of not receiving something that I ordered is a pain but I do get my money back.
I have also purchased from Goodwill USA infrequently and not been burned and usually the price is so low I don't worry about what I get shipped. I'm surprised that their description is fair when I don't believe most of their employee wouldn't be Photography experts.