I've burned through many containers of Muscle Milk powder (only the original, not the Collegiate formula nor the Light formula). I like the results I got from it, but the only things you really need to know are:
1. WHICH FLAVORS TASTE GOOD?
2. WHERE SHOULD I BUY IT?
Here are the flavors I've tried, and how they rate:
Chocolate Milk - Great, my favorite. Do not confuse with "Chocolate" or "Chocolate Malt" (see below).
Chocolate Malt - It's ok. Not as good as I'd hoped, but drinkable.
Chocolate - Not great. Surprisingly, the fake chocolate flavor is just too strong. If you mix it with another flavor it becomes tolerable.
Cookies and Cream - Great, popular flavor, an easy first-time choice
Mocha Joe - Good if you like coffee (which I do), otherwise I expect you'd find it horrid
Strawberries and Cream - Very good, one of my favorites, but I wouldn't want it every day because you're gonna get the strawberry burps
Natural Fresh Strawberry - DO NOT BUY! I can only describe this flavor as like drinking strawberry mixed with fart. Yes, you read that right. Fart. I choked down a container of this only by mixing it in low amounts with other flavors. Since then I've avoided all the "Natural" products out of sheer terror (and disgust).
Where should you buy it:
I recommend The Vitamin Shoppe, 2.47 (or 2.48) lb container, via Amazon of course. The price, combined with shipping, was always lowest or among the lowest whenever I purchased.