Couldn't agree more, I never use Onslaught outside IR...unless I need a closer so I don't miss a GCD due to mechanics. That way it's always available for that as well. Feels great.

Basically you are comparing a 250pot/50 gauge oGCD against a 590pot/50 gauge GCD, meaning your average GCDs (without gauge) need to exceed 340pot for Onslaught to be better. And they don't.