Anybody know how good Rosetta Stone is?

If you go to like best buy or something, you could probably find a generic rossetta stone type program for like 50 bucks or 120 the most I think. I'm am literally going to get one for spanish very soon. Mi espanol es muy debil en este momento. But it's good enough that I shouldn't have to pay 500 bucks to learn. I grew up around Dominican and Puerto Rican peoples my whole life too, so I have experience with how it's spoken.