Our Bosch (PUE611BB1E so bottom end of their range) is not very good at registering hands and turns off at the slightest hint of a drop of water, I'd certainly go for something with a slider per hob instead of having to select and then modify with + and - .
Cheers, Neff is one I'm looking at but their crap website and lack of email address is putting me off a bit.
@mashton the ceramic hob with the shit buttons I'm replacing is pretty new which is why I'm concerned. Maybe I just have crap fingers.