Mine really disappointed me in sodastream mode. A lifetime supply of weak, mediocre flavor. To taste its essence, pour some into a lemon lime soda... blah. Try mixing a good root beer with lemon lime soda and it highlights it rather than weakens it.
Of course you have to shake it a lot to get the sediment off the bottom. I tried adding double chocolate flavor drops, which seemed to help. Vanilla extract didnt help. I think a brown sweetener like amber or dark caro syrup would help... earlier posts said to add treacle or molasses.
Maybe i'm missing something, but why use this stuff if it doesnt do its job and you have to pile in cover up ingredients? I had better luck with the zatrains beans and rice mix that i included with their extract order.