Each flat sip soaks the palate with the synthetically sweet taste of hard tap water, full of all sorts of faint funky and offsetting nuances. The typical suspects are principally absent, flavors like apple and vanilla, and even the compulsory gummy mouthfeel is proscribed from an experience who could really use some character. The nutrition facts lists carbonated water but my tongue tells otherwise, every mouthful painfully listless. Without flavor or effervescence, AJ's Rush Sugar Free is essentially canned caffeinated water.
Each twelve ounces contains: taurine, inositol, caffeine, and B vitamins. The buzz is mediocre but lacks the sugar crash present in the original. In all, AJ's Rush Energy Sugar Free is twice as good as the sugared version, but you know what two times zero is.