It was pretty expensive for a whole family to use. I just ordered two to try to see if we liked it. That means there was quite a lot of packaging. We liked it but I feel the amount of packaging negates the plastic saving. If you made this in much bigger containers or even better, we could buy it in the supermarket, then we would definitely continue using it.
A very definite plus was that it doesn't contain linolool, which is a problem allergen at the moment and seems to occur in most of the toothpaste tablets I can buy in the shops at the moment. So once I can buy it in a shop, I will definitely go back to it.