QUOTE(juven69 @ May 10 2010, 11:05 PM)
Ya, but what I mean is it can never beat the good 'ol keypad.
Besides, the biggest problem is there's no FEEL whether you have press the key, so if you don't look, you can't be sure. For not sensitive keys, you might face problem not pressing the key although you have press it.
For too sensitive keys, you might accidentally pressed a few keys.
For balance in sensitivity, there might be less problem, but still you're not sure unless you look at it.
So, you might need to look at the screen more often compared to good ol' keypad which you can even NEVER look at it and be quite sure you make no mistake.
Plus, if it's on-screen keyboard is qwerty, it pose another problem due to the buttons are smaller and close to each other, hardly anyone can touch correctly without seeing the screen.
Q W E R T Y
Imagine hitting the button correctly without seeing, and this is only 6 buttons, actual "on-screen" qwerty keyboard is different, and also depends on the screen size and so on.
For numpad version of onscreen keyboard, it's far easier as there's only 3 buttons in a row. But still, there's no feel whether you have successfully press the button, unless you turn on LOUD volume for button press and possibly vibrations to help you feel more.
Nonetheless, for on-screen or virtual keypad/keyboard, it'll definitely interrupt the person more and requires more checking compared to good 'ol keypad.