Does anyone like spellbinder?

I barely build this item {{item:3907}} on any champs. What make me thinking about it is the duration (4s). Everytime I activeted it I barely have the time to use only one spell rotation (since spell are gated to CD). Comparing it to gargoyle stoneplate and essence reaver (time duration gate effect) gargoyle last for 4 second but even if you have all on CD u still be tanky and Essence reaver rely on Aa which are only gated by attackspeed and last 6s after using one auto. I think that since is CD gated (with the few exception of ap Aa dmg dealer like teemo or kaisa), the duration should be up and the ap gain should be low. Tough?
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