Half the people that own these machines only use it to make sparkling water. That's a huge market in itself - Pellegrino, Perrier, etc. I've had one for three years. We go through about 1.5 tanks per month. Hardly a fad for us. In addition, about 5 family members or friends have been bought one as well, after seeing ours. This company will grow to a $2b plus mkt cap, easily.