What do you like best?
The use of images in the program lifts Rosetta Stone above the levels of other language learning programs, helping to create mental associations between images and words. Most useful for vocabulary and best paired with a conversational program.
What do you dislike?
The coursework is highly repetitive, and you have to work through quite a bit of material that has little real-life applicability before reaching anything useful. You'll be memorizing the words for "child", "boy", "girl", "run", "milk", "water," etc. for many an hour before reaching anything conversational level. There is also a tendency for the program to run into errors that can cause you to lose your progress.
Recommendations to others considering the product
Rosetta Stone is a very useful tool but you will want to pair it with another language learning tool to grasp the fundamentals of spoken conversation.
What business problems are you solving with the product? What benefits have you realized?
Rosetta Stone not only assists with language learning but with general literary skills by allowing you to understand the similarities between different languages, and by creating a better understanding of the fundamental constructs of communication and language structure.