Quill Coat is 68% gold efficient without its passive and active.
The regen passive generate 1/5 (7g) of an health potion and 1/3 (11g) of a mana potion every 5 seconds in the jungle. if this apply, it take only 1 minute in the jungle to become cost efficient.
Alternatively, the Quill Coat become cost efficient once the 4th ward is placed. Interestingly, despite the passive that make it act like a gp10 item, the selling price of the Quill Coat is high. It will already produce money if sold after the 3rd ward.
It can been seen as slot efficient since the owner benefit from both the ward and the cloth armor in the same slot.
UNIQUE Passive - Sapping Barbs: You gain 40 HP/5 and 30 MP/5 for 5 seconds whenever you take damage from a monster. Additionally, monsters who attack you bleed for 5% of their maximum health over 3 seconds (maximum 150 damage).
UNIQUE Active - Hunter's Ward:Places a Stealth Ward that reveals the surrounding area for 180 seconds (180 second cooldown - 600 range).