Lack of convenience is a major hurdle to eating healthy, however I'm not convinced that a highly-processed food supplement like Soylent is the best way to do it.

I have found that pre-packaged salads from Trader Joes are a decent tradeoff between price, quality, and convenience, at least for fast lunches and dinners. They are well portioned and easy to supplement with other ingredients like additional meat. Plus (most) salads have the benefit of low sugars and carbs which after a while will help cut cravings for less healthy foods altogether. The downside is that they don't keep for very long so you still have to make a trip to the store every few days.