Sorry, I don't think it would be boring, but I know my kids, and I think they need something a little lighter. I just don't have the time or concentration levels required to absorb all this right now. I have 6 kids, with 3 day care kids. Plus, it looks like it would take a full year, and they already have a US History credit.
However, even if we go with Notgrass I don't think I would want to sell the SL books because they look so good. I do dream of reading them someday. Maybe I'll wake up.