Are the offers for a free this or free that real?

I seen online where i can complete 2 offers something as simple a paying shipping to try out another product. They say you get either an iphone or ipad. Do these things actually work or is it fake? Has anyone ever done this and actually got the gift?
Update: you have to work for it so thats why i was confused? Don't go all hate mode! For some reason every one does that.
Update 2: This is one that says 2 offers and the first two is a knife set and the second is for a trial that you have to pay just shipping for.

Has anyone gotten any items this way
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