Personally, I feel that these little flavour cubes are a nice idea. However, they are quite weak in flavouring water. So, I have to use extra cubes. Thereby, making this particular item quite expensive. I do understand that the flavour of things is very subjective. My pallet is perhaps not so refined as others. Once I add cubes to taste the flavoured drink becomes very nice. In adding extra cubes. I do mean that I add only an extra one or two if I'm drinking from a flask. Also, I can smell the rubber gasket when I am drinking straight from the glass Waterdrop bottle. Maybe a silicone gasket would be better. A replacement gasket could be offered for the Waterdrop community?