Hi
Here's my two cents.
I am an SBIer and love it. I think people can't fathom why SBI is so valuable because they haven't done it, so don't have the subjective reality.
My very first site (full of mistakes, mind you) now generates 4000 visits per day and my income is heading towards full time levels. It's completely an information site. It is not an e-commerce site. I give away a lot of free information and my Adsense keywords completely suck, if one were to check out the cost per click. (By the way, Cubestat is completely wrong about both my traffic and adsense levels. It's only registering a fraction of what's actually going on with my Adsense - plus I make affiliate income and ebook sales over and above that.)
My traffic rolls on and on and grows on its own at this point. The site is nearly hands free. That means I have an e business that is now nearly running itself, while my income increases more and more. All my traffic is free search engine traffic, because SBI gives you the tools to create pages that search engines love. I have never paid a dime to get traffic. Most of my pages are in the top 10 on Google, many of them at #1.
The secret to my success is that I read and followed the Action Guide as well as use the SBI tools. I also frequent the SBI forums. I worked very hard and it has paid off. I think it worked to my advantage that this was my first site, because I didn't think I "knew it all" before I started. People who aren't willing to work the SBI system have problems sometimes. You get best results by following the advice. The more closely people follow it, the better it works.
I never expected anyone to "give" me anything and assumed complete responsibility to persist and break through - although the support in the forums really, really helped. There were times that I could have quit and almost did, but I didn't.
The breakthrough happened and now I'm experience similar success to the case studies and other successes. The information is real and true.
Thing is, now that I have done it, I can do it over and over and over again. With or without SBI. I know how to do things where others would probably fail. Perhaps I'll use Wordpress for my next project, perhaps not, but my current site will not move from SBI. One of the keys for that site are the SBI tools. It would not be the success it is without Brainstorm It!, Analyze It! or Content 2.0. Those tools alone are worth well over $300 per year. Those tools are exactly why SBI is not just for newbies.
Anyway, the last thing I want to say is that there are alot of myths associated with SBI! because people just don't understand it. Here's a short list that addresses some of the misconceptions that exist on this thread:
Urban Myths About Site Build It!
Please note that I'm not an affiliate here, and that is not an affiliate link. I personally don't care who uses SBI and who doesn't. In fact, the fewer SBI users the better, because that's just more opportunity for me. :-) SBI sites dominate the search engines in their niches. The less competition between SBIers, the better.
I just want to set the record straight because it has helped me so much.