You have discovered that it is a model-specific IMPLEMENTATION of any feature, like a touchpad, or Thinkpad-like pressure 'joystick', and even keyboard FEEL, which makes so important that the purchase experience includes actual HANDS ON experience in a retail store, so important.
It is analogous to handling a CAMERA to see how the button layout and control functions work, FOR YOU, before buying any camera, as well.
This buy-on-web has its limitations, and you have just experienced first hand a major reason to make your choice (or your exclusions!) in store.
Agreed however sometimes we have no choice when there is no where near you that sells what you are interested in or no way of traveling to get to a larger town, we dont even have a camera shop within a twenty miles of us.
Kind of makes all buying to be done blind with just the normal internet searches for reviews etc.
P.

