I had it done and so did my wife. we just got back from LA where she had it done. both of us came out w/ 20-40 to 20-20 vision.
for me, under decent eye conditions (there are circumstances where you don't see as well) I have 20-20 vision in both eyes. on days that it is really dry (my left eye tends towards dryness) i have 20-40 vision in the left eye, 20-20 in my right eye. definitely nothing to complain about.
my brother, who has a Lasik Eye Center in LA did both me and my wife.
like it was stated above, don't go with just anyone, experience is important. (i was the first patient my brother did, but I know his quality, nothing he has ever done in his life has been subpar. that was 1.5 years ago, since he has done a LOT of patients)
one quick experience, when i had my eyes done (it was by my bro then doing his fellowship for USC) at USC eye clinic, Kiki Vandeweghe had his eyes done the same day at that clinic. i met kiki and his wife. anyway, kiki was actually coming back to have his eyes touched up by another surgeon. he was a NERVOUS wreck. he went in and they it took them over 1 hour to get him settled down and do the touch up. i had some valium that my bro had given me so that i wouldn't be the nervous like that and i offered it to kiki who had just gotten out of surgery. his wife asked me why i had the valium and i told them my brother proscribed it for me so that i wouldn't be nervous. well needless to say, kiki and his wife were not happy that their doctor didn't take the same precautions.