To be honest this is just like muscle tech, jay cutler, phill heath and such. I have not used prosoruce but don't buy something depending on who uses it, keep in mind that he is making money out of recommanding it and we both know that he him self probably does not use it.
You're better off getting the name brands if you can afford it. Gold Standard 100% Whey Protein is probably the best protein you will find. If you're not sure about a product, buy the smallest size they have, go through it all, and compare it to past products you've used.
Generally if it's a celebrities' product its not a good one. I really wouldn't bother.