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Basically, the idea behind waterless cooking is nothing new. It has been around for a long time so, it is not really some advanced technology that makes some brands more expensive than the others. Probably it could be the grade of steel used (which arguably the benefits of a higher grade steel is minimal when it comes to cooking performance), marketing strategy and the place of manufacture. The other differences between the various brands and product lines also come down to the knobs on the lids and of course, the pieces in a set.
