TheLadders report [PDF] is based on data from an eye-tracking study of 30 professional recruiters who were monitored over a 10-week period as they they performed online tasks, including resume and candidate profile reviews. Recruiters rated resumes with an obvious information hierarchy as “easier to read.”
On a Likert scale of 1 to 7, self-written resumes (below left) averaged 3.9 versus 6.2 for the professionally rewritten resume (below right), a 60% increase.
Heatmap - Resume Eyetracking Before & After