I find myself surprised by the the on screen keyboard. It is not to difficult to get used to, having said that, I am not a great typist by any means and always watch my fingers as I typed, so I guess I like having the keyboard and the end result right in front of my face!
ive used everything from a stylus, mini bluetooth keyboard, keyboard case, full size bluetooth keyboard but having the convince of the on board keyboard is the best, just get used to it unless you plan to write papers and what not.
I voted yes, because in theory I do. Just not all the time, but only when I am at a seminar for work, taking notes. Personal use like replying to an e-mail, no, I use the virtual one in landscape.