My Daughter had this done years ago and I know a few other people who have had it done. They are very pleased with the results. I do believe it is not painful. I am not sure of the cost because they offer you a variety of treatments, it may also depend on whether you have "astigmatism" or on your "prescription".
When my Daughter had hers done,
she said she wanted to go on the "roof top" and shout to everybody how marvellous it was.