The only time the word 'success' appears,
"My experiment in using the Surface RT as my working computer on the trip to Las Vegas for CES is, Ive decided, a qualified success."
Note the use of the word 'qualified'. 'Success' is a relative term; her definition may not match yours or mine.
Me, I'd have called it complete failure from the beginning, based on carrying a second device. Even if I never pulled the Galaxy out, feeling I needed to carry it just in case would have demonstrated my distrust in the RT.