I've been following Viticci's stories and I do like the way he works on his iPad. On the other hand his stories also show how inefficient working on an iPad can be, because almost anything except the basic tasks involves workarounds and convoluted workflows.
Inefficient? Not sure I would use that word... Because I could argue that using an iPad is more versatile & flexible compared to having a Mac.
Obviously, with the iPad being built on iOS can have limitations... But from the standpoint of having touch input & the ability to use a external keyboard, there can be a greater functionality compared to OSX. Don't get me wrong... OSX is a more powerful OS compared to iOS.
But I wouldn't call Viticci's methods inefficient... He chooses to use the iPad as its main computing device and iOS provides ways to get work done whether its unconventional.. It works.