And just to echo what Sherif said, the great thing about SBI! is that it doesn't do all the work for you. A lot of SBI! copy-cats generate the content and do a lot of things for the customer that you should do yourself and it ends up hurting you in the end.
Ultimately you are the one who determines if your site will succeed or fail but SBI! gives you all the tools you need to help write better content, build your pages and market your site.
Also if you want to add Content 2.0 that's another $99/year (I didn't buy that feature.) It just basically allows your pages to operate more like a blog so people can leave comments. Ken's daughter uses it and you can see an example below (bottom of the page).
http://www.anguilla-beaches.com/angu...ap-hotels.html