And right now, this product is in its pre-early adoption stage. There is little need to criticize the product, since the formula will most probably be tweaked and updated after its first public release. Unless there is some question about the utility of the idea, or the capability of the inventor, I think optimism is warranted.
Rob Rhinehart's food replacement Soylent now has a crowdfunding campaign.
If you're interested in one or more of these benefits, send in some money! There is also a new blog post.