It works perfectly and gas bottles last long enough. I always have a head start and therefore longer crashes (one bottle makes us 2-3 months to 2 people who regularly drink sparkling water). No electrical connection, so no cable, this unit ranks and comes out easily.
However, I recommend that the capsules are sold with because they do not bring more than a normal syrup and cost by cons really much more expensive, unless you do not find the flavors in syrup form (eg. Coke taste Cola).