great review, i think its size and concept are its greatest assets, its perfect for working situations and has has already been said, add a keyboard and its perfect!!
And if you're on the road a lot, think about a folding keyboard. OK - for sure - they're a compromise, but the portability means you always have it with you and can just get it out on the train, plane, bus or boat and type away to your heart's content. The larger keyboards, of course, are nicer to use but they're a pain to carry with you for a journey.
I use mine every day, I cant say that i could totally replace my macbook/imac.....but i wouldnt want to anyways..
Im a building designer, and need to use Revit/Autocad, for which the larger the screen and more powerful machine, the better (plus they only run on PC's and mac for autocad). But since im freelance, i use things like timemaster for jobs, numbers for my spreadsheets and graphs, Penultimate & sketchbook for quick sketches on site, Project Planner for my Gant graphs and organiser for all my appointments/jobs/tasks etc... I also use goodreader to take to the plans for clients to view on screen and make the markups needed on the screen, saves me printing out plans over and over again during the initial design stage.
plus the games for 'downtime' :D