Even my parents had a Soda Stream.
However, the more favorable model 'Cool' with the plastic bottles.
So I know both systems.
The clear advantage of this model is the handling. One only needs to set the bottle, close the device and can gush.
When 'Cool' Model, the bottles must be screwed into the device, which can sometimes be a bit fiddly.
Also see the 'Crystal' course much fine, and also the gas cylinders make a wertigeren impression. This we now use as a water carafes for 'normal' tap water.
The only downside is that it just is only one size at the bottles in this model, but I think that can be cope.
CO2 capsules keep in daily multiple use for several months, and are so much cheaper than mineral water bottles. It saves space and the carbon dioxide content can be determined even.
In addition, the Soda Stream glass bottles are safe harmless than the plastic packaging from conventional water.
Actually, there is for each of the happy times 'bubble' drinking, no good reason not to buy the part.