There are two basic things you need to know about before buying an espresso machine.
The pump pressure of the machine – You only require a pump pressure of 8-10 bar to produce a real espresso (even on a bar machine). Usually a machine with a nominal pressure of 15 bar is more than adequate for than home made espresso and cappucino. Gaggia Syncrony Logic espresso machine
The temperature at which the espresso is served is so important that machines that have the right features will help you to make the perfect espresso at the right temperature with minimal heat loss. Filter holders should be kept hot as this is the first piece that comes into contact with the hot water. If the filter holder is cold you will loose temperature very quickly. Make sure you look at the metal used on the filter holder.
Most basic models have aluminium filter holders. They are inexpensive and light but serve a useful purpose because aluminium is a good heat conductor. They will work well if you ensure they are always kept in contact with the brew head of the machine. If you do not keep it in contact the filter holder looses its heat very quickly. On the other hand filter holders made with brass (usually chrome plated) are ideal. They take a little longer to warm up but retain the heat better. They are usually heavier and are more controllable. This is the type used with bar machines.
If you are interested in good espresso but do not want to learn the art of making it with a high degree of skill there are now a number of Gaggia bean to cup machines available. Gaggia Syncrony Logic espresso machine
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