Rosetta stone? Do you like it?

Sorry to burst your bubble, but RS is the most overhyped, overpriced and overrated language "gimmick" in the whole wide world, because it will never be able to bring anyone anywhere near fluency in any language whatsoever, let alone mastering a language. All it does is make you repeat simple things like a parrot, nothing else. No context-based learning, no grammar, no learning feedback, no conversation, no nothing! Therefore, it will never be able to replace real face-to-face language lessons nor any other conventional language learning methods.