As-Seen-on-TV products: Which of them ACTUALLY work as advertised?

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You've heard this before. Me? Too many times. I almost memorized all the spiels: Only $19.99! Buy now and you'll have this amazing thingamajig! But wait there's more... call in the next twenty minutes and we will slash 99 cents off! That's right blah blah blah. I am really curious about these home shopping network products. Most of the time, they're just advertised so outrageously that you can't help but think if they're just exaggerating the effects of said product. I mean, come on, isn't that an old salesman trick? Putting superlatives on EVERYTHING? Has anyone ever ordered one of these as-seen-on-TV products and got their money's worth? Please give honest and factual answers. Please dear mylotters, help me restore my faith on home shopping networks :)