My Dad has been looking at getting a tablet for work, but I haven't really looked at tablets, as it'll be a long time until I can afford one so I have no idea :\ He'll be using it mainly for checking email and document work, so I guess storage won't be an issue?. He'll be needing multiple .pdf files open at once, though (wasn't sure if the iPad OS still had issues with this). He'll be on the road a lot, so will need 3G. As such he was hoping to put him own SIM from his work mobile into the tablet, but I discovered that the iPads use a microSIM. The Galaxy Tabs seem to be able to take it though? Anyway.. from your experience, what tablet do you think would suit his needs best?