Espresso machines come in all shapes and sizes and with a lot of features. A big part of making your own espresso is preparation, which can include grinding and tamping the coffee before starting the machine. With machines that come with the ability to use pods, the preparation stage of the process is nearly completely removed, and all you are left with is loading a pod and starting the machine. By the way, a pod is a coffee capsule that you can load into the machine as is.
An espresso machine that comes with the possibility to use pods is a great asset. Pods make the brewing process easier overall and they are completely optional. A surprise guest just dropped by? You don't have to start grinding beans and everything. All you have to do is pop in a pod and have an espresso ready in no time. Want to go for the full brewing experience? Just switch the containers on your machine and you can start using freshly ground coffee. Users report getting great value out of these machines, as their prices are much lower than standard espresso machines. However, users overall still prefer their old-fashioned machines; the overall scores for pod machines are significantly lower on average (with a few exceptions, of course).