pros and cons
pros
quests give you something to do different
you learn your char against different kinds of mobs
you get free things when done with quests exp, sp, gold, items
cons
your inventory fills up faster
sometimes you dont get skill points for finishing quest
you do have to delevel more while doing quests
some quests all should do
all inventory expansion
ivy quest
any that just require a certain number of mobs to kill
