In the beginning of the latest episode (episode 42) of the Ihnatko Almanac Andy is discussing how he is using iPad when being on the road.
I found this very interesting considered that I myself use the iPad for the majority of tasks. I find myself using the iMac only for heavier tasks in Lightroom/Photoshop (read: serious image editing), the occasional CSS editing or music notation.
All remaining regular tasks are done on iPad. It always works and is fast and writing works so much better on the device as well.