I used to be pretty skeptical about those types of things, but a lot of people have had great results from some. Not all are created equal though, which is why most people say they're no good when they don't really know. Hope this is one of the good ones!
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry