Apparently it's excellent. I used to work for a guy who was good friends with the owner of the company that produces Rosetta Stone, who wrote the first version of it.
It uses immersive and associative learning techniques to, theoretically, teach you languages the same way a child learns them. Of course, your brain plasticity is much lower than that of a child, so the verdict is out on whether that's the best way to teach. Still, people rave about these products.
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