I had Lasik in 2001. I was legally blind uncorrected, 20/40 corrected. I started wearing glasses when I was in 1st grade, and my eyes had gotten progressively worse over the years. I was able to wear contacts, but those of you with allergies know that isn't always a good choice.
I was barely eligible for the surgery, and it set me back $3000. Insurance picked up the other half. Best thing I ever did for myself. My post-op test after 15 minutes put me at 20/35 uncorrected vision. Within six months, that had improved to 20/15, with my left eye slightly weaker than my right. I still have a slight stigmatism, which they couldn't correct at the time, so I wear glasses when I drive, just so it's easier to read signs and such. I'm told they can now fix that, as well.
As for halos, I had slight occurrences at night during the first six months, if I allowed my eyes to get dry. However, they were less than I was used to seeing with glasses, and after six months, they went away. Frequent use of eye drops during the healing period is a must.
I would absolutely do it again. If you are anywhere near Northern CA, I highly recommend Jeffrey Turner, of the Turner Eye Institute. They have offices in S.F. as well as San Leandro and Concord. Don't go cheap, research your doctor, and be aggressive.