The Maestro Project

There are many steam cookers that are being sold in the market. More so online than in shops. I will get to the shops in a bit.
The steam cookers sold online are of many kinds, some are even made of plastic. However, I chose to compare the ones that are similar to the Maestro.
As you can see, all of them are made of stainless steel. However only the Maestro has the double walled stainless steel technology. Which would mean that the steam has an effective passage to travel through, cooking the food from the inside.
Another thing is that these steamers run on 300 watts, which would mean it takes longer for the food to cook. Because the Maestro uses 600 watts, it cooks food in half the time, and as effectively, using as little energy as possible.

Dueteous and Libra are Indian brands, the last cooker in the column, Zhongshan Baibang, is of Chinese make, and as you can see, it consumes the most amount of electricity. That can't be good.
I have been trying to find the prices of these different makes, but their websites strangely do not provide it.
I found these details on online shopping websites like indiamart.com and alibaba.com