I love eating and the social aspect of sharing a meal with others, so I can't see myself having Soylent in this capacity whatsoever, but I would definitely like to try it as a breakfast and quick lunch alternative. I have the bad habit of rushing in the morning and rarely eating, so Soylent seems like a great fit.
It's also interesting to realize that the food most people eat really is not very healthy, even when it consists of mostly healthy ingredients. It seems like most of the people I know probably don't get nearly as much fibre as they should, so a product like Soylent could be a beneficial addition to many people's daily nutrient intake.