I am a European American vegetarian who does a lot of Indian cooking. I had heard about the "whistling pressure cookers" of India and was intrigued. I liked the idea that instead of watching a clock, keeping track of the progress of your recipe was a more informal system of counting whistles - a great thing for we tired, harried multitask-ers. I didn't want to spend a whole lot of money to find out if I liked them, so I tried this dear little Prestige 4 liter aluminum cooker at an economical Amazon reseller price. I love it! It makes even complex recipes very simple and fast, and for we vegetarians, the cooking of beans and pulses is now effortless and quick. I load it, seal the lid, and let the dear little thing hiss at intervals, which I can keep track of while I am doing something else. Well, I had been expecting a whistle, but mine lets go with this wonderful "Old Faithful" style HISS! No waiting: releasing the pressure is so easy, because all you have to do is put a spoon under the weight that fits on the spout, and it is safely gone in seconds and you can open the lid. Opening and closing it is very easy. I have full confidence in its safety. If the food is not cooked to your expectations, you put the lid back on, fire it up again, and let it go a few more whistles/hisses. I do find that my meals tend to require a couple more hisses than the recipes call for, so I wonder if the pressure is not as intense as in some other models, but that it is a minor issue. It is easy to clean and maintain as well. Excellent design - simplicity itself! It's up there with my Cuisinart as beloved kitchen tools. No matter how tired I am, I can toss a few things in, and have a delicious, nutritious fresh meal in less time than a microwave. Having fallen in love with Prestige Indian pressure cookers, which I use for all kinds of recipes now, I will be investing in a larger Prestige stainless steel one for when I cook for guests too. In the time it took me to write this review, my dear little Prestige 4 liter aluminum pressure cooker prepared me a restaurant quality dinner. Enthusiastically recommended. Thank you, India, for your wonderful whistling/hissing pressure cookers!