I tried provigil for two weeks and it made me feel like a zombie. I was less sleepy but I felt kind of 'hazy', like there was something between myself and my thoughts slowing down the interaction. It did make me slightly more productive, and able to completely focus on boring tasks.

One interesting side effect is that it made me a bit more social and during those two weeks I had dozens of extremely boring (in hindsight) conversations with random co-workers. It seems to lower my threshold for boredom more than anything.