I've used it for Spanish, Swedish and Korean. Gotta say, it's much more useful for a language where the grammar/writing system/etymology have something in common with your native language. The whole learning by intuition thing seemed to work for me with Swedish and Spanish (native English speaker) but not at all with Korean.
Rosetta Stone tends to work by slowly introducing new words, language constructs and such without explicitly telling you what they're trying to teach you. You kind of figure it out after a couple of units. But I found that while I could do that in the European languages, Korean was just too far removed from English to be able to comfortably make that leap of understanding.
Rosetta Stone tends to work by slowly introducing new words, language constructs and such without explicitly telling you what they're trying to teach you. You kind of figure it out after a couple of units. But I found that while I could do that in the European languages, Korean was just too far removed from English to be able to comfortably make that leap of understanding.