I do know someone who had a bad outcome to surgery to correct her vision, though I can't remember whether it was radial k. or lasic. She learned after the fact that her cornea was too thin and the surgery was inappropriate. She can't see worth a damn, can't work, can't drive, and will be disabled for the rest of her life. It isn't reversable. Her sister had the same experience. She's an acquaintance, I'm afraid I don't have any more details.
It seems critically important to gather lots of information regarding your individual eye, rather than relying on statistical odds.