Almost well constructed

But:

After nearly a year in use of plastic lever is pressed to the valve broken.
The to be seen from above "bubbler" button (visible when the hood removed) goes into a lever which in the end, the valve of the gas cartridge pushing, whereby the gas is released and enters the bottle.
The plastic tab breaks from the inside, directly at the point at which it encounters the brass valve.
(Matrialfehler I? Do not think so, because otherwise the lever from the outside was broken inside. The lever was simply too thin and made of a (in my opinion) Bad Plastic)

It only original cartridges were used.

Annoying, because in the end so goes the environmental performance of the device "flutes".