BigViffer, yes, I'm referring to the 100% Whey Powder (https://www.costco.com/Cytosport-100%-Whey-Protein-Powder%2c-6-pounds.product.100225865.html). I've never bought the shakes so I can't compare. Doing a little reading this morning, though, I note that Gold Standard offers both a blend of isolate and concentrate, like the product I'm using, but also a 100% Isolate that I think I'm going to give a whirl. Also available at Costco and you can't beat Costco prices!
I appreciate the feedback!