I took it, along with daily topamax. It works great if you take it early. If you wait too long, sometimes it doesn't fully get rid of the pain. And definitely don't take more than 3 times per week or you could end up with rebound headaches like lostinthewoods mentioned, I've been warned against that by my MD as well.
I will say, it makes me spacey and foggy after I take it for a few hours. So it's a little rough if you hav work or school to deal with!