Anyone experience of combined induction/extractor hobs? Several manufacturers seem to have introduced these recently - Neff/AEG/Siemens/Miele etc. Apart from additional £££££, they seem like a brilliant solution to removing some constraints from kitchen design and being aesthetically pleasing . Also removes the chances of nasty head bangs! Do they really work as well as a traditional wall mounted extractor unit? Begs the question "Why didn't someone think of this before?" Too good to be true?