Also the fact that it won't prevent future changes to vision. I'm thirty now, and my vision still continues to slowly get worse. I fear I'd be paying for a 5 year reprieve from glasses and then be back to wearing them with side effects I also have to live with for the rest of my life.
I had PRK since I had too much correct to do normal lasik. Its essentially lasik but they don't cut a flap first, has a longer recovery time, but is actually more accurate than lasik. I went from a -10.5 diopter prescription with contacts (pretty thick if I wore glasses) to 15/20 vision without. The only noticeable side effect was a very slight halo effect around bright objects at night. This is caused by the edges of the laser correction area becoming visible when the iris is fully dilated. For heavier corrections the max diameter of the correction area depends on the prescription and how much material they can take off in the center of the correction area, and for lasik how big they can cut the flap.
I made it about 10 years without glasses after that and now use very light prescription glasses mostly for driving and reading. I still don't need glasses for most things, and its awesome to see the alarm clock in the middle of the night without having to fumble for glasses first. I also don't worry about losing a contact and having to drive home with very impaired vision. I don't regret the decision at all even though I'm back to wearing glasses.