Protein Shakes for Breakfast?

I am using GNC's Pro Performance 100% Whey Protein (cookies n cream). I blend this with water, yogurt (greek or regular), and spinach every morning (on days I work out). I workout about 5-6 times a week with about an hour to two hour workout sessions.

Is it bad to have these protein shakes every morning? I love that it keeps me full and I guess I can say, I'm addicted.