I tried Soylent 1.4 for four days (one meal per day - eased into it). I had incredibly bad headaches. I felt weird, like my vision was impacted. It felt like I was getting a fever, even, although I wasn't. I've never had a "food" have such an immediate, negative impact on me. And it tasted pretty bad. Even if they describe it as "neutral," or like pancake batter, that's not exactly a good experience.
Unfortunately, I couldn't get myself to continue eating it. I would give 1.5 a shot, but only if they had a 1 or 3 pouch demo for cheaper. Not investing another $85.
1.4 tastes terrible. I've been using it, but I've developed a very specific ritual for making it palatable, and it's still not an enjoyable experience.
If 1.5 is anywhere near as tasty as 1.3, then I strongly recommend that you give it another try. You might be able to buy some from Craigslist or something? I don't know if that's still a thing.
Unfortunately, I couldn't get myself to continue eating it. I would give 1.5 a shot, but only if they had a 1 or 3 pouch demo for cheaper. Not investing another $85.