We have had the Carbonator Pro for a good 6 months and are basically very happy with it. Unfortunately, from our point of view, the stainless steel lid with the glass bottle (steel on glass at the thread) does not fit at all. We have already broken the glass thread on 4 glass bottles -> replace glass bottle or exchange/guarantee. The lids of course remain in perfect condition. From our point of view, a plastic lid for the glass thread (plastic on glass) would be more gentle on the glass bottle. When we opened the bottle (with gas), part of the glass bottle got into the glass and this went unnoticed. There is clearly potential for optimisation here! We have informed Aarke...let's see.