The Reserved Articles sections state that "We are not trying to be secretive, but we are trying to get people to read the most important articles (those that are freely available) first." Well, my Bible is freely available, so shouldn't any and all Bible studies be so too? That kind of secrecy makes you look real, real suspicious. Come on, you know it's true.
Hey Brian, course I remember you. I hope things are going alright now.
Anyway, as for the reserved articles, from what I remember of them they are pretty much like the rest of the articles on the site. I think the reason they are sectioned off is because the group felt it was better that the public read the more basic/important stuff before they move on to the reserved articles. Also, if I'm not mistaken, anyone can access the reserved articles for a few weeks after they are first written because they are located in the "New Articles" section on the website.
IMO I would think that the restricted articles are less offensive than the ones freely available, so I wouldn't worry about missing anything.
Hope that helps.