I'm also skeptical that one can live well on soylent alone. There's nothing bad in soylent AFAIK, but there's no way of knowing whether soylent is missing anything vital. With this in mind, I wouldn't be worried if someone replaced one or two meals a day with soylent. But I'd hesitate to replace all meals. I think it's irresponsible that the makers of soylent keep pushing the idea that one nutrient drink can replace all your meals, though I have nothing against the product itself.