Did you know that in April 1995 the first laser hair removal device was cleared for use by FDA? At this point we have a pretty good sense of the efficacy. It works best on people with light colored skin and dark colored hair, and most consumers see a permanent reduction in hair between 1/3 and 2/3. Some people get more and some less, but that’s the general range. For best results, I recommend having it done by an experienced physician.
This laser hair removal patient guide is pretty good, and my site below lists several others.