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No, they don't work.
It's more or less a con.
That's not to say they might not make some improvements, but they could also hurt your site really badly, and the chances of your making your money back are very small.
You can almost certainly do better for yourself with a little study.
However, search engine work is harder than it has ever been, and less in the control of the small webmaster than it has ever been.
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