I've attended KublaCon once, and.... Dragoncon, I think. They were both pretty fun, although it was hard getting into certain events.
I really liked going, mostly because at KublaCon I actually got into one of the six runs through a Dwarven Forge Mastermaze. Out of like 3000 people, me and my friend were two of the lucky 36. And at the other Con i went to, I got to be a Sith Apprentice in a Star Wars larp, until I pissed off a bounty hunter and shot a hole through my chest and put a thermal detinator inside. That was... pasty.
So, yes, I like going to cons, when I hear about and can pay for them...