These models typically have a built-in grinder, measure the amount of grinds, doses it into the brewing chamber, extract a programmed amount of espresso, and discard the spent grinds into the dumpbox - all at the touch of a button. Higher end models froth milk in one step as well. These espresso machines work well in high volume facilities, such as self-serve cafeterias, airport locations and train stations. These machines require the most maintenance and service calls for adjustments. Therefore, daily volume should exceed 300 or more cups per day in sales to warrant the expense.