Use is simple and the result is very good. In the long run I think it is a bit cumbersome, but since it already takes some time to complete. Currently I use the Cool Twister only irregularly. It is easier to cool by itself the boiled water and to fill in a thermos. So you have water for several vials ready for immediate use and that's a lot of value, because with a screaming child (especially at night), every second counts.
