i'm convinced that anyone who owns a slideout does not type with great frequency. they may type more lengthy messages but they definitely don't type frequently. if they do, they own a Treo or Blackberry and not a slideout. or is it that they "have to have wifi" and a big screen and don't mind the additional confusion of a slideout?
give and take...opportunity costs i suppose.
But surely thats quite legitimate? If your typing volume is high and the frequency low, then a slide-out with a larger keyboard would be ideal. Its not better or worse, just different.
Surur