This device is easy use and performs very well. There are two parts of the frother. There is a Frothing Sleeve for cappuccinos and when the Frothing Sleeve is removed, it reveals the Steam Tube for lattes. Frothing: Frothing Sleeve is in place over the steam tube. Hot steam and air are injected into the milk. The air will swirl inside the milk creating silky dense froth on top of the milk, ideal for a cappuccino. Steaming only; Frothing Sleeve is removed to reveal the Steam Tube. Only hot steam will be injected into the milk. This is ideal for a latte. Important: To work properly, the Frothing Sleeve and Steam Tube need to be free of any milk deposits from earlier useAmazon was more expensive on all but one of the T-discs we buy and thats even with the multipack (5 packs). I knew they would be expensive but I am surprised that buying direct from Tassimo is the cheapest. Also interested in the price rises at supermarkets and this pre-dates me buying my Tassimo machine. I'm also surprised there aren't third party websites selling them at a discount. They actually seem to be most expensive on eBay!