I have only gone to one when I was maybe 12. It was sort of fun I suppose. It sort of just turned me off watching anime because I was able to see all of these so called "anime fans" gathered in one spot. Suffice to say I did not want to be grouped in with them. It is also pretty much just a massive ploy to get you to spend lots of money on a bunch of overpriced useless shit you do not actually need.