tablet with integrated keyboard

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I observed that one of the difficulty for tablet users is working by using virtual keypad which uncomfortable for typing and taking much space of the screen of the tablet. We usually will buy separate keyboard to solve this issue but still not as comfort as working with real keyboard, as our finger usually bigger and the feel of typing by tapping on the screen not really comfortable for some people. That maybe the reason some manufacture tablet complete with build in keypad, Asus Transformer is one of them. So the user can utilize QWERTY keyboard not only keypad while they can also work without it just like all tablet does. What do you think about keypad problem? Do you feel trouble to use on screen keyboard as well?