Double check each feature when you read pressure cooker reviews and figure how you can benefit from it. The quick release option is mandatory. It should be built into the pressure regulator. Plenty of modern units allow this feature, which releases the internal pressure without actually releasing any heat. Why is it useful? Simple. For example, you can add more ingredients later into the recipe, then return to the original pressure. This feature is also handy when you are done cooking and you have to take the food out. It adds to your safety standards and prevents unexpected problems with the pressure.