Last Friday I dropped by the medical foundation for the first of my three Gardasil shots.
I noticed no side-effects, it's possible that there was slight swelling that was hard to see from my point-of-view of the injection site on my left shoulder.
The nurse injecting me, as well as the paperwork, made a point of referring to the shot as "the HPV vaccine" rather than by its product name. I wondered about this for a while, but surmise that a generic name like that is more likely to trigger a "wait a minute" response in case of error, so I can see at least one possible point.
Next injection is two months from now, the one after is four months later.