As for the site, I'm glad you joined. I think everyone's skeptical when buying stuff on the internet, but as I've been here over 6 months, you can figure out how I feel.
The real beauty of the site, much as with private lessons, is that you don't focus on a specific song the way you do when you're just learning guitar from sheet music. You break it down into chord progressions that sound good, scales you want to use, inversions if you want to get a different sound and all the technique you need to lay down a sweet rhythm and rock a solo.
Good luck.