As far as job organisation on a tablet goes, I found calengoo is fantastic for job entries, searches and generally replacing a diary, it syncs with google calendar so jobs can be updated in the office and will appear on the tablet in the field immediately providing that they have data or wifi.
i have used a tablet of sorts as a work diary for years since the days of the old psion sienna, through the 5 and 5mx series and numerous windows jornadas and android tablets and now use an ipad mini which has had 5 screens over 3 years but they are cheap to replace at £15.00 a piece on ebay but the one thing that I absolutely could not do without now is Calengoo, check it out, it is available for android and apple and can sync lots of separate calendars at the same time.