Well,
I have tried it and will say I would not pay that much for it. But, I have a club sponsorship from Hammer and can get good discounts. But I have never ordered a tub of it.
You can get a similar benefit by combining Perpetuem and whey protein powder, or just drinking milk and eating a banana after a workout.
Depends on your volume of training and goals. If you are doing huge-volume training and have trouble making yourself eat right after a workout, it may be good but I could not justify spending that much money.
Also, if it is so great why is your friend not using it all up?
I would pass.
Laura