Have anyone heard about "Gomad"? where you drink like 3 gallons of milk a day alonside with paleo eating to gain muscle size really quickly?

I know is not really primal, since it comes from a cow :P and we don't process the lactosa very well and so on, but what's the science behind it?

I mean, it is a cheap source of protein, carbs and fat that can go with paleo.

What do you think?