As with washing machines, there is a wide variety of choice, but at first glance it is a little harder to see why some are more expensive than others. Generally, this will be down to the build quality, the number of programmes/temperatures or features.
Table top: about 4 place settings. Small enough to sit on a kitchen worktop.
TIP: You should always keep the salt and rinse-aid topped up in your dishwasher. The new generations of tablets and powders on the market may already contain these agents, but most manufacturers recommend still keeping salt and rinse aid in the machine.