Is Ubid a legit auction site to bid on?

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I just curious whether Ubid and redtag both websites are legit? Ubid is a website for online auction, and I saw many pretty good items on its website for bidding. But some of those prices are extremely cheap, and I just couldn't believe what I saw. For instance, this morning I saw a Macbook, which is running on Snow Leopard version of Mac operating system, the bidding price was $65; could that be possible? And other items also unbelievably cheap too. On Redtag, this website selling either new, or refurbished items, mostly computers, electronic or watches. I also curious if anyone has experience with both websites, or place bid or purchase anything from both sites?