Rosetta Stone isn't supported by most linguists who study foreign language acquisition. It is also ridiculously overpriced and never explicitly teaches even basic grammar, something which FSI points out helps almost 100% of learners.
Rosetta Stone isn't supported by most linguists who study foreign language acquisition. It is also ridiculously overpriced and never explicitly teaches even basic grammar, something which FSI points out helps almost 100% of learners.