I have had a wider ceramic hob (930mm) in the past, moved house and this kitchen has a smaller hob and it really bugs me. I have a chefs pan 30cm diameter that I use a lot, but on the smaller hob it covers most of it not really leaving enough space for other pans for cooking veg or rice, etc.
So, yes, would definitely recommend wider hob.
Have also heard that induction hobs can be noisy when used at full capacity, i.e. all zones on at same time. Apparently the magnets make a loud buzzing sound.
OK, I don't own one but have just ordered the Siemens Built in iQ500 900cm touch control ceramic induction Hob , extra wide , stainless steel (it says 'ere) Model no EH975SME11E . Had a try of one in the kitchen showroom and it seemed good (my worry was not having a gas hob). V. responsive and the controls are "slidey" rather than keep pressing to increase or decrease heat IYSWIM , which seems more natural to me . The hot bits are sort of side by side in a row of 4 rather than in a square , which is a configuration I had with previous gas hob and I much prefer it to four square. I trust the kitchen chap I have and he swears noone has had a problem with this one.