Is not Spear of Shojin overpriced?

I am looking at Essence Reaver then Spear of Shojin and I cannot tell what the +200 gold is for. Both give 60 AD, both give 20% CDR, 25 crit worth more than 250 hp, ER passive gives permaboost while SoS passive is only active for 6 seconds after you ulted. How Spear of Shojin worth 200 gold more than Essence Reaver? :S
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