I got through the first level of Russian and Japanese, and halfway through the second level of Russian. I'd say you get a decent feeling for the language, more than I got from other attempts to learn languages. However, it never tells you _why_ something is this or that way, you always have to figure that out for yourself. For a lot of things that doesn't matter, but I kept confusing the two counting words that are used in Japanese and it didn't give a clear reason as to why you should use this one with this and that one with that.
I think it'd work well on a tablet or so, since it uses only large buttons, but back then touch screens weren't so common yet so I had to use a mouse. I think I'd like it more if I had a tablet computer to use it on. There's all kinds of fancy features like a form of speech recognition to test if you actually pronounce it properly, but I haven't used that so I can't comment on that either.
As whether it's worth the price, cough I can't comment on that. Also depends on how you have to spent ofc.
hope this helps, good luck :)
Rosetta Stone tends to work by slowly introducing new words, language constructs and such without explicitly telling you what they're trying to teach you. You kind of figure it out after a couple of units. But I found that while I could do that in the European languages, Korean was just too far removed from English to be able to comfortably make that leap of understanding.
Why don't you try some of the free online services to learn a language? After participating for 4-6 weeks, you will understand your own commitment level and then make the jump to invest in Rosetta Stone.
When I was learning french, it helped me when I watched TV in my own language and read the subtitles in the language I was learning. I would then do the reverse. Watch the show in the language I was learning and read the native language subtitles.
I have tried the Rosetta Stone demos, and decided that it wasn't worth the price. They are basically fancy picture flash cards.
With Pimsleur you will get vocab, simple grammar and canned phrases. With that you can build other simple phrases, at least that was my story.