Personally, I do not have experience with Rosetta Stone; but my Mom has used it and she thought it was a pretty good program to learn different languages.
She used it to learn Spanish.
She lives in Arizona and wanted to learn Spanish due to the large Latino population there.
My Mom creates a lot of artwork and sells them at community venues.
She has a lot of Spanish speaking customers, so she wanted to be able to better converse with them to enhance her sales.
I hope that you find a program that works for you.
It is always a benefit to be knowledgeable in other languages.
Good luck.