beviek, and anyone else interested in Coffee Joulies, mine arrived yesterday afternoon and I used them this morning. They worked great. My coffee maker brews really hot — the right way to brew. And my Thermos brand coffee tumbler/travel mug thingie keeps it very hot so it takes forever to drink. Except not anymore. Cooled it right down to a good temperature for drinking and stayed at that temperature throughout — though staying the same temperature throughout is a characteristic of the vessel I drink out of. There are cheaper ways to cool the coffee. I could also use a less effective travel mug, but if I sip slowly the coffee can get too cool. Anyway, 3 liters of very hot coffee turned into three liters of perfect drinking coffee with all five ‘beans’ in the mug. Reviews in other vessels are mixed, though one “not too useful” review I read used them in a way the instructions suggest not doing. They’re really for keeping coffee at a good temperature in an insulated container with a lid at that they work. And the coffee tastes better at that temperature. Their Joulies plus travel mug price is high, but pretty close to the price of both bought separately, I just already had that exact mug. more info on request and if I have more to say after more use, I will.