The ease of use, ability to find new customers in my market with little effort from me (as far as targeting goes). Not really anything that I dislike about it so much but nothing stands out either! Use them if you are looking for easy management over your advertising campaigns/placements etc through one place - they do this well!! They have also helped us target our ads more effectively by giving recommendations regarding who we should be reaching via their audience data which can help improve ROI significantly too.