How did guild perks work out for you?

My guild in World of Warcraft is level 24, and will reach level 25 soon. And the most remarkable thing about that for me is how little I actually noticed it. Some of the advantages are downright invisible, because nobody really notices an X% bonus to this or that. Others are weird: Why did Blizzard make the heirlooms you pay for with justice points rather expensive, and at the same time offers new heirlooms as guild perk which are extremely cheap in comparison? The one perk that ended up being m

World of Warkraft...