Induction cooktops power use

These cooktops seem to be all the rage now.
Some chefs are claiming them to be more efficient than gas or electric equivelants.
In what way?
I've just been looking at Miele's website(as an example thats all), there induction cooktop needs a 10.6Kw supply Would this also mean a big power upgrade?
The only thing I can see efficient about them is that they only heat the pan, so don't waste heat, don't cook up the house etc.hence there 'efficient'.
Do they work like a microwave or chinese water cooled wok range and do the job in an instant?

check it out here http://www.miele.com.au/au/domestic/...dels_17195.htm

Anybody use one of these cooktops?

I'm just looking at it from a sustainability aspect

cheers

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