Please do not recommend the Griffin product for the MacBook Pro. It is not rated for 87W.
Has anyone tested this scenario in real life? I'd imagine that if the machine is idle, 60W would at least provide break-even, and in sleep, should be able to charge it. But that's assuming that the identity negotiation works properly with this hardware combination.
Unless you've got all CPU and GPU cores blazing, and one or more devices quick-charging. And then it'll temporarily dip into the battery.
I havent used any of them so wouldnt feel comfortable recommending any individual model