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I've been purchasing the 5 pound tubs of MGN Whey Isolate from here: http://www.muscleandstrength.com/store/pure-whey-protein-isolate-bundle.html
I like the fact that MGN's web site says that all of their products are gluten free. I was previously using Optimum Nutrition's 100% Gold Whey Standard. I think the ON tasted about the same or maybe a little better, and it mixed better. But the MGN is all whey isolate instead of a blend of various grades of whey, it is gluten free, and it is cheaper.
Avoid the peanut butter flavor. It doesn't mix well or taste good (IMHO). The chocolate is very good. The cake batter is very good, too. I just recently got the cinnamon bun flavor which is well reviewed in the google searching that I did, but I haven't tried that one yet.
I recently began using Muscle Gauge Nutrition's whey isolate protein product. It isn't certified, and it doesn't say gluten free on the label. But, it was recommended on another thread here, and their web site (musclegauge.com) says all of their products are gluten free, down at the bottom of every page. You might find better pricing through muscleandstrength.com.
I previously used Optimum Nutrition's 100% Whey Gold Standard; Double Rich Chocolate was my favorite flavor. I contacted ON and they replied with the specific flavors and product lines which contain gluten... They said the products which don't have glutenous ingredients are produced on the same machines, but that they clean the machines between product changes.
So I decided to switch to MGN, because of the all-products-gluten-free claim that they make, and it has fewer ingredients, and whey isolate is the best form of whey protein that you can get... Also it might be a little cheaper (they're pretty close in price).
I've had no issues with the Muscle Gauge Nutrition product thus far. The Ice Cream Sandwich flavor is the only one I've tried at this point. It is good, but not a very strong flavor. I mix it with water and it tastes a bit watered down when I use the recommended 8 ounces to one scoop (70 grams, IIRC).