In an automatic espresso machine, a programmed control can stop brewing after a selected quantity or cycle. Some machines allow the user to adjust those settings. This is different from assuming the appliance also grinds beans, doses coffee and prepares the puck; the word automatic describes particular functions and should be checked against the actual model.
For a comparison, separate beverage programming from the rest of the workflow. Find out how the machine measures or controls a serving, whether settings can be changed and how easily the user can interrupt or repeat a brew. Also inspect temperature control, milk preparation, water supply and cleaning arrangements. A programmed quantity does not remove the need for suitable coffee and preparation.
When dialing in a recipe, record the dose, the beverage obtained and the result in the cup. Keep those observations distinct from the name of a button such as single or double, whose programmed behavior can differ by machine. Choose automation that helps repeat the drinks you want and that is straightforward to maintain. This is a category guide rather than a claim of firsthand testing or proof that one control system always produces superior espresso.
The conversation
A good question can make a better brew.