These machines are extremely popular because they make your coffee taste much better. Coffee beans start to lose flavor as soon as they are ground. With these machines, the whole beans are ground and then immediately brewed. This means the coffee is fresh and full of flavor. Your espresso will taste different from instant or pre-ground coffee. People also love them because of how convenient they are for everyday use. With just one machine you can grind your coffee beans, brew espresso, and steam/froth milk.