I personally believe exit popups have been abused to the point where they are now hurting conversion rates of people who use them. One exit popup is ok, and I am not bothered by just one. But those sites that are just plain in your face to the point where you want to strangle the guy who makes it seem impossible to escape them... that's the guy who is ruining it all for everybody else who uses exit popups. They are annoying. And over use and abuse of them is changing the way I personally look at the credibility of the site owner using them.
So I ask your opinion and experience with exit popups. Do you think they help or hurt business?