I waited for quite a while, since I was originally interested in RK (or even PRK). When LASIK came along (and after I'd waited a while to make sure they weren't burning holes in people's heads) I decided to take the plunge, figuring that even if something better came along a few years later, that'd be a few more years I would have to wear glasses.

Basically, it came down to the typical risk/reward ratio. The risks had come down enough, and the reward was reached often enough that for me, it was the time to do it.

Oh, and the fact that I could use pre-tax dollars to pay for it also helped...