The best (because only) on the market, but ...

Anyone who has had other bubbler in use, is certainly enthusiastic about the handling. Unlike eg for SodaStream Cool is a boon if you nich must screw or einfummeln more the bottle! Saves a lot of time!
As the only device with proper glass bottles you have a kind of monopoly, and that is especially the price (I speak from accessories) significantly.
In my eyes, the price / performance ratio is absolutely at the top! If I build quality (plastic case) look at myself so, it's a matter of time before a competitor brings a similar glass bottles device on the market and this then with a little better quality and not as 'rickety' out of the market!
If these competitors then also offer bottles that are not quite as unwieldy (BEFORE handling design!) And especially after '3 sip' is not empty, then he has the nose right out in front!
Yes, 0,6Liter capacity is not enough - because it is only the effervescence!
Glass bottles are great and a must but if a dishwasher for a passage already the thread 'ausfranzt' and then you look at the price of the spare bottle, which is actually almost an outrage!
Or I 'Monday bottles' ???

Conclusion:

+ Glass bottle
+ Easy to operate (without 'fiddling')

- Quality (especially in the bottle) and 'quality feel'
- Bottles are bulky and too small va!
- Price (especially the accessories)