Funny thing hapenned recently at a photo shoot meet-up with fellow APUG-gers in Hamilton, Ontario when some one pulled out his IPhone or Blackberry to measure light with a dedicated app. I asked him to compare his reading with my 58 years old Zeiss Ikophot. There was no difference. That is not to say one is better than the other.
I'm happy that my job never forced me into owning an IP, BB, androids or whatever they call them today. Such a device comes with the expectation that you are available to your employer/ customer 24/ 7 so even if you don't pay for it it still takes away some of your freedom.