C.C.
I had this done when I was 17. It DID work; I haven't had a sinus infection since then (and had had sinus infections almost constantly before that). I promise I'm not trying to scare you, but it was the most painful recovery I have ever been through in my life (and by comparison, when I had all 4 wisdom teeth out, I was up and around with no issues the following day, never taking anything stronger than Tylenol). Maybe they didn't give me any good pain meds because of my age, I don't know, but I can remember being in a horrifying amount of pain. Make sure they give you the biggest, baddest pain meds available, and don't hesitate to take them. In my case, my face was pretty swollen and I had a big black eye (due to the swelling), which lasted about 2 weeks.
However, I know others who had a much better experience and their recovery was not so bad. In any case, painful recovery or not, it was 100% worth it, and I would do it over again. Like I said, I haven't had a sinus infection in over 20 years... priceless! :)