My bad mistaken serious mass as ON's 2:1:1 recovery, they are both colored green! Serious mass does not have fast acting carbs (sugar). My statement still stands though. Simple carbs (sugars) are needed for post workout. One wishing to gain weight would be better off with 2:1:1 recovery.
I agree simple carbs are Important post workout , I always have banana post workout
Weight gainers may benifits for those who are very skinny , but generally weight gainers are waste of money as they are more expensive than normal whey protein