Did you ever experience the auctions on net?

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A large number of products of all types are autioned on rediffmail.com under the auctions section. I want to ask simple questions : How safe and profitable it is to take participate in such auctions? How is the quality of the products that are auctioned there? What is your opinion about such auctions on net? Did you experience any one ever? Are there any other sites providing best deals in auctions?