Only criticism or what I would like to see these bottles would also be in larger sizes. 600ml is now not so much. Will this Bottle - next to glass bottles (not always practical) - use only to drink.
If there are problems, I'll update it here.
... If not, I'm still a happy customer :-)
EDIT: regarding my little critique that only 600ml bottles are offered is, I noticed that the bottle fits exactly under the common and most sinks. Ie who much tap water drinking is very good with a 600ml bottle bediehnt. If the bottle is greater, the filling would be difficult or perhaps impossible. I use the bottle only to drink and fill all other drinks from cheap plastic bottles in this one (also the carbonated).