i had it done 7 years ago. it was $4k, and absolutely worth it.
when i had it done, they told me: 1) there are no serious risks; no one has gone blind from it 2) in the worst case, your vision will return to normal over time
i was 19 at the time, and they convinced me that, since i would need reading glasses around age ~40, then was the best time to do it, to get as many glasses-free years as i could. yeah, it was a salesman-style line and i bought it, but i am glad i did -- the advice people are giving about waiting a few more years likely just means that you are getting less for your money.
i had 20/100 vision and am now 20/20. if yours is not so bad as 20/100, i can't say whether or not it's worth it.
i have some "starbursting" effects, but they are minor, and in any case, definitely a small price to pay.
oh, and that $4k included any touch-ups i may need in the future, if my vision does start to revert (i haven't needed any yet).