The quality of protein is good, About flavour I would recommended vanilla flavour instead of choco delight or caramel . I have to say that recovery is fast after the workout and I can see change in my body. Good taste good mixibility only takes some shakes to make it fully dissolved and find result in some days.
About efficacy it depends on your diet and exercise. And about the prize 64 to 65 gram per scoop is a ok deal of you buy a pack of 2 kg.