I've had two 4kg tubs of this stuff now and it's amazing. I started out at around 70kg just under two months ago, My overall stats were 395kg or 870lbs (Bench, Squat, Deadlift) and now I'm roughly the same bodyfat, but weighing 77kg or 170lbs and my overall stats are 445kg or 980lbs. I changed my workout to encourage a strength gain and also adapted my diet. With the right diet and workout plan this product can make a world of difference, espcially if you're finding it hard to rack up the calories/protein content in your diet. Admittedly though, the first week is pretty tough on the stomach if you're not used to high protein levels. I went from averaging 110g a day to excess of 210g per day and 2000 calories to 3000 calories.