I like the Chai a lot. Not quite as much as I like Cacao -- quite a surprise since I love chai lattes and normally do not like chocolate -- but I definitely like it. Ranks above Nectar for sure. I do feel like I get just a hint of artificial sweetener blerk with the Chai that I don't detect in other flavors, but it's still so faint it doesn't interfere with me enjoying the overall experience. Especially since the caffeine content is fairly negligible, I will be making Chai part of my regular rotation.
The Vanilla I don't care for as much, but that's to be expected. I just don't like the bitter taste of coffee. And for a beverage with coffee, Cafe Vanilla is more than decent. I'll have no trouble finishing the box that I ordered but probably won't order any more. And it's just as well, because I have little use for highly-caffeinated Soylent. I usually use gum or mints to get my caffeine and l-theanine because I don't necessarily (or even usually) want a meal at the same time I want caffeine. I prefer to decouple the drug from unnecessary calories. Now if they made a regular Soylent drink flavor with just the vanilla flavoring from this one and no caffeine or coffee flavor? I bet that would be dope.
I'm not sure how I feel about the new bottle lid design. On the one hand, I think it's awesome that there's finally nothing to peel off the top of the lid or under it. No extra steps and nothing to worry about disposing after you open. But on the other hand, I find the new lid very difficult to twist off. I've been using a bottle-opening device that I keep in my drawer to make it easy, but next time I need to open a bottle on the go I suspect I'm in for a great deal of frustration.