> But after I got my first iPad, the original, I found that I could type at nearly the same speed

Speed is certainly one issue, but the ergonomics of typing for an extended period favor separate screen and keyboard components. I too use a table for typing and while I'm pretty quick at it, I can't find a comfortable position that lets me do this for more than half an hour at a time. For this reason alone, the inclusion of a keyboard has certainly made me take notice of Microsoft's offering.