I've been using Soylant as my daily lunch meal for several months now. Enjoy the convenience. Taste and texture are acceptable. Not in any hurry to switch to Soylant for all my meals -- just enjoying the lunchtime convenience.
The biggest criticism of Soylent seems to be "Who would ever want to give up food for all meals forever?" when that's not really what the point is.
I would have to consult my doctor, but my guess is that a Coke and pickled egg would meet those requirements.
The founder said in his first blog post about the subject that, prior to pursuing his Soylent idea, he was eating a lot of fast food and frozen burritos.
Of course, if you're just looking for a cheap, quick hunger fix, those things will work. As will a candy bar, bag of chips, etc. But if you're trying to eat healthy, it's kinda tough to find something that's also quick, convenient, and filling. Soylent solves that problem.