Rosetta Stone success stories?

I got Rosetta Stone (the language learning software) with all 3 Mandarin language packs a while ago. I recently finished pack 1 & was wondering, has anyone out there completed an entire set of language packs with Rosetta Stone & at the end, did you feel comfortable enough to call yourself fluent in your newly learned language? Just how effective is Rosetta Stone? Is there another program that you think is more effective, like Pimsleur? Thanks for any advice you can give.