How far could only cope without a pressure cooker ?! I myself have indeed not think that you necessarily need something, but was (God be thanked it) from my wife disabused. After a few consistently successful cooking test runs, I can now say: Such parts are genuine in every kitchen. They facilitate cooking tremendously, save money and time current (and therefore money) and are fairly easy to use. And WMF speaks naturally as a brand in itself, mean that the pots make a quality impression and this confirmed in practice. But you should have read the (extensive) Instructions and this might also not put too much (did that leave my wife ...) and the web application (we have the perforated) you should still treat yourself to, which is very useful, eg for potatoes. Would be nice if two lids were there, but then the price would significantly speed up. All in all, a super set at a fantastic price-performance ratio!