Adding my own reviews to the mix.
The Cacao really surprised me. I am one of the rare people who doesn't care for chocolate, and I wasn't planning to order any Cacao at all. But a box was mistakenly sent to me in place of one of the Original boxes I ordered, and I decided to give it a try. I'm really glad I did!
I completely agree with the assessment that Cacao tastes like chilled hot chocolate. It tastes exactly like Swiss Miss hot chocolate mix to me, which is the one of the few chocolate products I more or less enjoy. Whatever the flavor is in chocolate that I usually don't like, it isn't present here. Also, I was pleased to find that while the Cacao is pretty sweet -- almost sweet enough to be cloying but just within the bounds of what's still good -- I don't detect any significant artificial sweetener aftertaste. A total win.
Still, my initial assessment was that although Cacao is unexpectedly enjoyable, it's not close enough to my tastes that I would spend the extra money to buy it regularly when I find Soylent drink to taste just fine plain or with my own flavorings. But after a couple bottles, I actually find myself craving Cacao a bit and am considering putting it in regular rotation.
FWIW, my girlfriend -- who does like chocolate, and is generally unwilling to drink Soylent -- says it has a "fake chocolate" flavor and reminds her of powdery or chalky chocolate protein supplements. It sounds like some people here concur. Whatever "fake chocolate" flavor is, though, I like it better than normal chocolate flavor.
Nectar I'm not so crazy about, or at least I wasn't at first. I agree with the folks (basically everyone?) who compare it to fruity cereal milk; I would say it reminds me slightly more of fruit loops than fruity pebbles. But lemon-ier, to the point of just slightly conjuring pledge. That would be ok, but what I don't like is that it's just too sweet and too intense for my taste. The comparison someone made to yellow and orange starbursts also seems apt; straight-up, I'd say it tastes like a cross between liquified yellow+orange starbursts and fruit loop soy milk. I also find the nose very floral and perfumey, and overwhelmingly so if you drink it out of an open vessel like a glass (which I normally don't). Surprisingly, despite the super-sweetness, I again don't taste any significant artificial sweetener aftertaste with this.
If I mix the Nectar 50/50 with the original, I find the resulting combination more pleasant. This brings the sweetness and fruitiness down to a manageable intensity, so it tastes less like starbursts and more fully like a lemonier/kinda floral version of fruit loop soy milk. Highly drinkable, but not my fav.
Similarly to the Cacao, my initial decision was that the Nectar was ok, if less good than the Cacao, but I don't see it as something I'd prefer to plain or self-flavored, and I didn't think I'd be buying more. Yet I find that it's growing on me. There's something categorically different about Nectar from other Soylent flavorings that keeps drawing me back to it. So maybe I'll grow to like it enough that I keep a little around? We will see.
Plz plz, banana or cake batter next, plz! From experimenting with protein powders and Lor-Ann oils, I have found those to be the best matches for the drink's natural flavor profile to date. Or better yet, a savory flavor!