I have one and use it all the time.
There has been a thread on this before. The difference is that those who can't see the need haven't got one whereas everyone who has one has made soup the old way and thinks a soup maker is better.
It is wonderful- put everything in and switch on and that is all you do. I love it.
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it 'tapered ' in shape. She also didn't use cold water to start with which may have 'upset' the cooking time ??