Experiences with Laser Eye Surgery?

GodLessOne asks: "I am about to get my hands on a reasonable lump of cash and I am working on my list of ways to make it an ex-lump of cash. All of the normal geek things appear on the list, but one item that I keep considering is corrective laser eye surgery. Would anyone care to share their real world experiences? I worry that the people selling it are the only ones saying how wonderful it is, and what percentage of people show a marked improvement afterward. Are there any stories out there relating how bad it can be if it goes wrong?"