Self-Study vs. Classes

'Sup /lang/.

Which is better when learning a foreign language? Self-Study or classes? Which do you prefer?

>>82
How many words did you have to look up in the dictionary though?

What would you reccomend as good study techniques then? I can only speak English fluently but recently I've been sort of self-teaching myself Korean, Japanese, Spanish and Italian, using various sources, but all of them ones used in the classroom anyway. Are there any other methods exclusive to slef-study that you would reccomend, or did you just read that Swedish grammar book REALLY fast?