Just had my first Soylent Bar. The first few bites I really liked -- tastes like the inside of a Twix bar, i.e., graham cracker + caramel. Wouldn't want to eat it except as maybe a dessert, but that's okay for me.
However, as I continued eating it, and my taste buds adjusted to the sweetness, I realized that the sweetness was masking an underlying bitter, unpleasant flavor. By the end of the bar, I was grimacing with each bite at the bitterness. Also, kind of burns the throat, makes me really thirsty.
Overall rating: 2 out of 5.