SFI: Is it a good way of earning online?

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Recently I was back again to my online money-making adventure wherein I search the world-wide-web for possible opportunities to turn my free-time into a profitable one; I've joined some paid-to-click (PTC) sites already, paid survey sites as well. Yesterday I came across this SFI site (http://www.sfi4.com/10917701/FREE) and signed up. Well, I'm not really familiar about how it goes so as of the moment I'm spending some of my time getting to know it more. I've also read some reviews and comments about this SFI thing and all of them are positive; some claimed that they have made a lot of $$$ already. So if you want to join me in this new adventure, let's get it on and share ideas and updates. Also, if there are SFI members here already, I need your tips. Or maybe I should ask, is it a good way of earning online?