What to look for in an induction stovetop? This is a sad story, because I've already bought one and am not completely happy.

The good:


Power - 9kW.
Fires - 3 fires from small to large (14cm - 28cm).
Timer - From one to ninety nine minutes for each fire.


The bad: The controls.


They are incorporated in the surface and are very sensitive. When cleaning the surface it will power down the stovetop.
If you put anything on the controls, they will flash an error message.
There is only one up and down button. when more than one fire is 'burning' you have to activate the fire you want to change. You have to cycle clockwise through all the fires to do that.


What advise would you give to anyone looking for an induction stovetop?
If you like to cook using 3 or more elements at once, ensure you buy a sufficiently powered model. There's nothing more frustrating than upping the power on one element and watching another one reduce at the same time.
Touch controls look nice but they're horrible from a usability standpoint. I always had problems with responsiveness with wet or greasy fingers. 
Cockroaches love induction.  I don't know if the frequency attracts them or it's just the heat but they will come and eat out the wiring, even if you've never spotted one in the house before. It's a common problem as it's hard to seal the electronics for thermal reasons. Board replacements are expensive. It's one item I would consider an extended warranty on.
As for any 2" cooktop, larger pot/pan sizes can't be accommodated if you're using 3 or more elements. Go 2'8" minimum.