The most important question one must answer when considering this product is will Rosetta Stone reviews as the advertising suggests be a magic gateway to language learning that is all you need? The answers are certainly yes.
First, this is an expensive product. Make no mistake, when you pay for a heavily advertised product like this that you are, in part, paying the cost of the extensive advertising that brought it to your attention and put you in a mind to buy it.
Second, although Rosetta Stone is an extremely well thought out and useful system for review, practice, improving reaction times to prompts in other languages, and gaining fluency through exposure to variable contexts, it is not a complete language course.
Conclusion: whatever language you want to study, seriously consider Rosetta stone. Also seriously consider buying a Pimsleur and a Living Language course to go along with it, and seriously contemplate the very un-Rosetta Stone-is subject of studying verb conjugation rules, grammar, and usage and verb tables. With Rosetta stone, you can speak and learn language well.