Don't get me wrong they could be expensive, but you will be saving so much overtime you won't believe it.
Not only they are super convenient, but also they are super efficient. You will see a big difference in your electricity bill.
Contrary to most beliefs, there are still many houses with no thermostat even a basic one can save so much energy.
Modern dishwashers use so much less water than handwashing. Not only you get clean dishes, but you save water too.
You should always have one of these at home or in your car to avoid waste. Metal ones work too, I just like these ones better.