I got my iPad last November. For the first week, I mostly did a little web browsing, watched some video, and did a few other basic consuming things. During the month after that, it slowly started to replace my (aging) laptop, and I began to do nearly everything on my tablet. The few "full computer" related tasks I couldn't do (well) on the iPad would be done on the desktop, but even so I was using my iPad as my primary computing device. By around May when I got my new laptop and started using my iPad for consuming again, I was able to type at 60WPM on the touch screen. I was able to type comfortably and accurately too. It is entirely possible to use the iPad as a primary device, and the reason I moved back to a laptop was not because of any inherent difficulty in using it to create content, but because I found that certain games I wanted to play with my friends while out of the house were Windows only... as well as the horrible notification system in iOS.
Funny enough, the iPad did change my requirements in a laptop... I now have an 11.6" screen on a computer that can get 7-8 hours of battery life. The iPad has ruined me
