I had this today, and it's pretty decent. It's a lot like drinking a bottled Starbucks Mocha Frappucino, but it's fortified with whey protein powder and several different vitamins and minerals, so it's like a punched-up, higher-protein version of a Frappucino. So if you're lacto enough that you don't mind drinking bottles of cowmilk, it may be worth looking into. It has a slightly sour undertaste, though, that could just be the fact that I'm not used to cowmilk anymore because I drink it so rarely. Let's hope it doesn't make me sick.
The good news for strict non-dairy people is that I don't like it as much as either the Vanilla Chai Tea flavor of Perfectly Protein or Silk Coffee flavor. So you're not really missing out on anything wonderful. I give it three stars purely on taste-- fine, but I wouldn't be in a rush to get more.