Sparkling water, sodas, there is not a day when I do not use it. Very easy to use. We must put the filled water bottle cool (there are 2 included), en suite screw on the machine, press the button, and when she did "spritz" (x3), unscrew the bottle and either eat sparkling water as is or add the syrup concentrate (zero coke, diet coke, coke, lemon, lime, orange, grenadine, etc ....)
Gas cartridges are about 60litres then you do not redeem the cartridge, it is conssignée, you only pay for the recharge (in most supermarkets).
When we have guests, they find very good sodas, and began to turn all our machine.