The most striking observation from testing the Fire is that
everything is much too small on the screen, leading to frequent
tap errors and accidental activation. You haven’t seen the
fat-finger problem in its full glory until you’ve watched users
struggle to touch things on the Fire. One poor guy spent several
minutes trying to log in to Facebook, but was repeatedly foiled by
accidentally touching the wrong field or button — this on a page
with only 2 text fields and 1 button.