At this point, I'm not sure how bottled Soylent can distinguish itself from other bottled dietary replacements like Ensure, aside from the name.
This is where tech vs. business breaks down. Tech thinks everything has to be new, unique, novel, and the-best-in-the-world. Business is all about differentiation and marketing and getting inside customer minds. Even if Soylent was Ensure re-branded, they can still have a business by being "fuel for the tech crowd" instead of "feeding tube fuel" http://www.amazon.com/Nestle-Healthcare-Nutrition-85140100-U... It's all…
If you look at the nutritional info for Ensure[1] and Soylent[2] you'll see that Soylent has more calories, more fat, no cholesterol, more sodium, more potassium, less sugar, more protein.
Most important, Soylent has a more even distribution of the daily % of vitamins and minerals. If you drink 3 bottles of Ensure you're up to 180% daily value of Vitamin C, 240% of Vitamin D, 180% Manganese. The even distribution makes it easier for it to act as a complete meal replacement not just a diet or sports supplement.
My feeling is also that Soylent measures more and tweaks their formula more. Their goal is to be a good cheap meal for everyone:
Soylent is a food product (classified as a food, not a supplement, by the FDA) designed for use as a staple meal by all adults. Each serving of Soylent provides maximum nutrition with minimum effort.
In a paycheck or two I'll buy a bunch of these and they'll be my lunch and breakfast replacement. Things like Ensure don't cut it as a staple meal.
[1] https://ensure.com/nutrition-products/ensure-plus#vanilla [2] http://files.soylent.com/pdf/soylent-nutrition-facts-2-0-en....