Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Spend the money if you're serious about learning!

I actually returned another brand's...CD set and exchanged it for Pimsleur's. I got one through the "used" link, although it's not really used...just less expensive. Although it cost...more, it is well worth the price! I'm serious about learning Spanish and want a program that works. This one works! It's not just a bunch of phrases rattled off to you at random intervals...there's a systematic method that brings up the words/phrases at exactly the right time so you can remember them. This company obviously did their research! I'm not sure what that research is...and quite honestly, I don't care...as long as I can learn Spanish. I haven't tried all the programs out there, but I've tried a few and this is by far the most effective so far!