[squeaky-clean]

I know those, and they don't match any of my criteria. Slimfast has no flavors that aren't dessert drinks.

For a 400 calorie serving of Slimfast original, it's over 36g sugars (vs 9g Soylent). Slimfast Advanced has almost no sugar, but is "sweetened with non-nutritive sweetener" (from their website). I can't find which actual sweetener it is, but most artificial sweeteners upset my stomach and taste more terrible than sweet.

Complan is also loaded with carbs, (33g sugar + 30g else) and has no fiber.

They're marketed as meal replacements, but I don't see how they're anything but vitamin enriched milk shakes.