I think it does depend very much on the type of use you give your Jazz as to how much benefit you gain. For example LV has said the heated steering wheel is not as important to him.
I go out every Wed to the pub with school friends going back 70 years. Because I drive I don’t drink alcohol, but I can tell you, when I come to drive home at 11.30 on an icy cold, wet night, as I walk to the car my mind is focused on a lovely warm steering wheel, and how quickly the seats will make me feel warm.
In the grand scale of things on a very long journey these matters are not really relevant, because the car has heated up, but if you use your Jazz for local journeys, from cold often, you do realise the benefit you have already paid for, even though some people think we are wimps…….. I don’t care