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Why don't you just buy Ensure or Carnation Instant Breakfast? They already exist and are well known, that you can buy anywhere. Or make yourself a bowl of oatmeal. Or eat leftovers from the night before. I think that the only reason that anyone's interested in Soylent is the current startup/crowdfunding bubble hype, not because it's actually anything particularly new. Soylent is to Ensure as Groupon is to coupons. Be…
Ensure tastes like shit. If Soylent tastes reasonably OK, and has stronger guarantees that it can be a true meal replacement than supplements like Ensure, then sign me up.
As far as the taste, it's too soon to tell. Indications are that it's pretty flavorless http://gawker.com/we-drank-soylent-the-weird-food-of-the-fut... (outside of joking reactions like "It was great and I love it. I don't want to eat anymore.") Given that they aren't particularly focusing on trying to make it taste good ("I'm not trying to make something delicious; there are already a lot of delicious things. It's all about efficiency, it's about cost and convenience."), I doubt it will wind up tasting much better than Ensure.
I just don't get all of the excitement over Soylent. It seems like a solution in search of a problem. It's pretty damn easy to get a healthy diet for cheap and extremely low effort, as long as you don't care about flavor and variety. Rice, beans, and grated cheese covers pretty much all of your nutritional needs (maybe toss in a multivitamin per day to be on the safe side), takes about 5 minutes of work and 15 minutes of waiting for it to simmer, you can prepare a week's worth in advance and reheat it over the course of the week, and it will cost you less than $5 per day in the US. How is Soylent supposed to be so much better than that that it will "disrupt the world food system"?