"I have been using Optimum Nutrition powders for many years, originally with their "Pro Complex" formula in the late 80's. The taste is usually quite good, and they mix well.
I have tried the Double Rich Chocolate, and think I just got tired of the same thing after 5 years or so, so decided to try out this Extreme Milk Choc. Wow. It is great tasting.
The Double Rich still is good, but the flavor is milder, less "chocolatey" if you will.
I also like Optimum's Vanilla Ice Cream Whey. The Cake Batter is pretty good too. The Chocolate Malt tastes like Whoppers candy.
For shakers, the Tupperware shaker is a good one, and so is the BlenderBottle - sold here on Vitacost for under $6. I like the smaller one (18 oz?) because the 25oz. BlenderBottle is pretty tall.
So I definitely recommend this flavor of Whey protein, it has great taste and here there is a good price."