I have been using Scivation Whey for about a year now. I switched from Optimum Nutrition due to the rising cost. Three years ago I was able to buy ON Whey for $55.99 for 10 pounds, now I believe it is up to $75.99. The only difference I notice between the two is that the ON whey mixes better. Other then that, I couldn't tell you that I notice anything different.