Everything is fine. I use WMF's perfect plus series of pressure cookers, and the effect is very good. Quiet, safe and reliable. Pay attention to replace the sealing ring regularly. The design is simple and practical. Fishler is recommended for general stainless steel soup pots and milk pots. Corning visions series is recommended for high-shed silicon heat-resistant glass soup pot. If you want to use a non-stick pan, recommend woll. Iron pot recommended staub's enamel cast iron pot.