I've tried win8 beta and surface at the microshaft store.
I think there's a chance both may go the way of windows vista.
the win8 touch screen software is flaky. touch any krApple or android screen, move icons around. now do the same with win 8 touch screen. first thing I noticed is that it loses track of my finger. so moving an icon around may drop it somewhere in between.
or to see it, try opening up a paint program. if you draw a single line, it may break several times.
the soft keyboard. try putting in an address in the address bar of a browser. that's hard enough. try filling out an online form with the soft keyboard. the soft keyboard covers fields so that there's no way to fill some parts of the form.
those big ugly purple rectangular buttons are hideous.