I had it done a few years ago when I was 31. I was nearsighted as well and wore contacts and glasses since 3rd grade. I think they told me that my vision was like 20/200 to 20/300 before the surgery...all I remember was my contact prescription was -2.5 in one eye and -2.25 in the other.
I got up from the surgery chair and went into an exam room and was tested at 20/10. I went back the next day, 1 week and 3 months later and each appointment was the same. 20/15 in each eye and 20/10 together.
The only negatives about it for me was for the first 6 months or so it hurt to look at bright lights, a white wall, and especially when I went outside without sunglasses on...that really hurt at first but it went away and I hear it's completely normal. I also don't see as good at night compared to my contacts/glasses. I get the halo effect around lightposts like in Quake 1 but it's not too bad. I don't even notice it anymore.
The pro's completely outweigh the con's. Do it, you won't be sorry. Unless, of course, Flanders was right and your eyeballs just fall out in 10 years.