Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works well, expensive

I've used pretty much all of the anti-flea applications I can find, from Advantage (and Frontline) to the cheaper stuff. I went to Advantage after being disappointed with Frontline and getting a lecture about how the cheaper stuff was unhealthy for my pets. Advantage works the best of any of them, but I wish it didn't cost so much.Not only did it get rid of the flea problems quickly, it holds up for a month. It also is by far the easiest to apply of any topical anti-flea application, which is worth something, especially when you have a cat that hates to get even minimally wet and a dog that gets into everything. It also dries faster and doesn't stink, like some of the cheap products.Worth the money? At least as much as anything else out there.