First some quick background:
I am learning both Japanese and Chinese. I've only studied Chinese for four months, since spring, in Taiwan and I will be going back in August for another four months. With Japanese, I've studied for a year 1/2 in college but have forgotten a lot since going to Taiwan. In January I will be starting at my new college in Japan finishing up my bachelors. So basically, I am learning these two languages first hand.
However, I am still considering getting Rosetta Stone. I am hoping it might help me with my tones in Chinese.
So my question to you is, is it worth it? What are the pros and cons?