To copy over my earlier G+ comment:
ಠ_ಠ I completely disapprove of this. Soylent is a fun idea, sure, but Rhinehart's asking for $100k to launch a Soylent manufacturing company?! He hasn't even done even the minimal crappy self-experiments he could've done very easily, like randomize weeks on and off Soylent! Nor, AFAIK, has he published any of the results from the early volunteers or anything, really. This is ridiculous.
See also Hacker News
Made it really hard for me to poop normally.
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.