Semi-automatic pump machines are by far the most popular type for home use. They contain most of the same features as the automatic machines -- including the wand on the side for steaming milk -- but differ in that the barista must manually shut off the pump depending on the length of pull. (The length is the amount of espresso poured into the cup.) The first coffee to come out of the machine is the best because it contains more of the bean's flavor. Most espressos are approximately one ounce -- any more and it is considered crema coffee -- any less and it is considered ristretto or restricted espresso. Automatic machines differ from their semi-automatic counterparts in that they account for the idiot factor essentially removing the role of the barista. The only tasks left to the operator are filling the portafilter with coffee, tamping it and banging the used grounds out of the portafilter when the espresso has been pulled.
Superautomatic models remove even these last few tasks. The barista has only to place a cup under the portafilter and press a button. The machine automatically fills the portafilter with coffee, tamps it and dispels the spend grounds. Some models even have a self-cleaning mode that decalcifies and rinses the machine.
Anyone who has priced an espresso machine knows that getting even a basic model can be prohibitively expensive. You can expect to spend around US$500 for an entry-level semi-automatic model. What's more, although they do less than their semi-automatic counterparts, piston machines are usually more expensive for being made of chrome or brass. Coupled with the high price of the machines is the fact that many manufacturers, in their zeal to create an affordable consumer model, skimp on the quality of their parts -- not a good idea for a device that works under high pressure. The result is an expensive kitchen appliance that does little more than take up counter space.
Of course, price is of little consequence to those for whom this diminutive elixir is more a passionate pursuit than a pleasurable pastime -- those for whom adding whipped cream or chocolate is an unconscionable aberration.
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