There are people on /r/Soylent who will offer to ship you a sample for free or cost of shipping only. I felt the same lingering doubt about shelling out $85 for something I might not like, but after reading about all of the different recipes to add/alter flavor, I felt confident I could at least get it to a drinkable state and not throw the money away, and that turned out to be true. It's actually not bad at all plain, and there are numerous additions that make it quite tasty.