Implementation process is quick. Doesn't take too long to upload changes into the engines as well.

That I can look at the complete list of my PPC / Facebook accounts in one view to sum up performance. The data reports out the back end can be very useful for individual report building.

kenshoo makes managing multiple accounts much easier especially where you want to make sure you don't overspend on your accounts. It also lets you make a lot of mass changes at once. It can help simplify those accounts and campaigns that are just so massive they can feel really overwhelming. There are a lot of automated tools that were nice to use, like auto bidding to particular ad positions.