Re: Interesting research
It's worth noting that, prior to the iPad, there had already been numerous portable ultra-portable computing devices. The Psions, iPaqs, even the old Newton. All of which were either dismal failures, or saw adoption only among the tech-loving market or executives looking to show off their business toys. At the time the iPad was introduced, it was reasonable to view it as a risky venture - another attempt to do what had failed many times before. Apple's success was down to a combination of improved technology allowing for a better product and a business model which ensured the product would be at least somewhat useful for the mass market buyer.
Most successful products are foreshadowed by a series of failures, which the designers of the successful product then learn from.