There was almost no information related to Provigil in that article. Sure, we got the standard, "Drugs are bad. Mmmmm...K?" But, that's just more noise. Why is is so hard to get signal on this topic?
Besides, I think that it's clear that the brain is a complicated and intricate combination of chemical reactions. I hardly believe that it can be considered balanced. Humankind has been self medicating with alcohol for centuries and the recent uptick in SSRI indicates that our brains may not not in fact be balanced (relative to the world we currently live in).
But, we're hackers; exploring new systems is what we do.