I am -5 and -6 and am seriously considering going for Lasik. I have worn glasses (and later contacts) since I was 6 or 7 years old. Contacts eventually became such an expensive business (not to mention tedious) that I pretty much only wear my glasses these days.
It's tedious and frustrating, every day I do the helmet-glasses shuffle 4 times a day, I put my glasses down somewhere and then I can't find them again, they're constantly hurting either my nose, my ears or my head, they're dirty, they bend out of shape or a lens pops out.. (fortunately I have not had a break in several years). If I want to go diving or have a fancy event that I want to wear make-up to I have to break out the contacts, and spend several uncomfortable hours adjusting to them again.
I'm gatvol.
I've been researching the Lasik eye surgery and the cost appears to be anywhere between 15 - 20k these days. The success rate is high but not perfect, roughly 85%, but you have to understand what they define as success. It's extremely rare for Lasik to be a complete failure (ie something goes wrong and damages your eyes further) because the flap cut and skim lasers are both computer controlled, very accurate, and the entire process takes only about 40 seconds per eye.
In the initial appointment your eyes are tested for suitability for the process. If your eyes are not suitable, you have to start looking at other options like a permanent contact corneal implant.
If your eyes are suitable (acceptable range of weakness, stable growth, stable strength, sufficient corneal thickness, minimal astigmatism) only then will you be considered for the procedure.
Once you undergo the procedure, you have to allow the eye time to recover and adjust. Everyone's eyes react differently. Most eyes adjust normally and the procedure is a success (no need to wear glasses/contacts anymore). Some eyes are not corrected perfectly, and you have between -0.25 to -2 instead of whatever worse eyesight you had before.
It is very rare for the procedure to be performed, and resulting vision is so bad that glasses are required permanently anyway afterwards.
The point of Lasik is to improve eyesight, not perfect it permanently. Some people are lucky and have perfected vision that remains for many many years. Others, like a friend I know, went from -10 to -1 (a major difference!) and only needed glasses on minimal occasions, but was warned in advance by the doc that it would degrade again and a second round might be needed. 10 years later she went for the procedure again, and should have near-perfect vision for the next 15-20 years.
In the end, I believe it's worth it if you have bad eyesight and glasses/contacts are becoming unpleasant and tedious.