I think if you change it back at the time of the divorce, you're better off. If you wait, then it turns into a pain (and is more expensive). I kept my married name when I divorced, I figured everyone knew me by it and didn't see much of a reason to go through the hassle. Of course, now I get the added giggles that the ex's girlfriend is just FURIOUS I didn't change my name. Apparently I "don't deserve" to have his name...