Swanny007 - 7:11 pm on Nov 14, 2013 (gmt 0)
It's just personalized suggestions from a human. Be open but willing to undo the changes. Some increase revenue, some won't though. Common things I've been told: Replace 728x15 link unit with 728x90 ad, Change 300x250 ad to 336x280 size, turn on text & image, etc.
If you have the opportunity to work with someone from the team, do it.