I have one. The root beer is pretty good. I don't know how cost effective it is. We spent around $100 for the device which gives you a "sample" box of a lot of the drinks, a CO2 dispenser, and 2 one liter bottles. You can pick up the mixes now anywhere. But I can usually find Diet Coke on sale for about $5 a case and I get the consistancy I like. They do not taste bad though.