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I first heard about this when Sean Hannity advertised it on his radio show.
According to
Only registered users can see links on this board! Get registered or login!, enough root beer flavoring for 12 liters costs $4.99 ($0.83 per two liters).
According to
Only registered users can see links on this board! Get registered or login! enough CO2 for 120 liters cost $29.99 ($0.50 per two liters).
So, excluding the startup cost, this soda costs $1.33 per 2 liters. Where I live, I can usually buy big brand names such as Mug and A&W on sale for $1 per two liter bottle. Store brands such as Big K cost around $0.75 per 2 liters. Seems to me that SodaStream is marketing to suckers.
But, if you add your own Root beer flavoring, the cost can drop to almost $0.50 per 2 liters. In the video, flavoring is added after carbination. Does anyone know whether flavoring can be added before carbonation without voiding the warranty?