I drink it 3 times a day in addition to my 3 meals. Been doing it for about 5 months. No gain in body fat. No loss in body fat either. It taste f'ing awesome. Banana creme, mocha joe with added caffeine in the morning. Stay away from Rootbeer, chocolate peanut butter, strawberry banana they suck.
I wouldnt worry about the calories. I've been clean for about 10 years now. I put on about 20 pounds(15 of muscle) since January using Elite K, NO2 and Muscle Milk. Say what ya want its been working for me.