I like their very professional approach to all our campaigns, they have always done an excellent job for us (and we are not just saying that!).
They're open minded people who listen closely what you want from them when developing your strategy or campaign/ad copywriting etc., so it's easy working together as partners! Nothing really at this moment but i would say if any issue comes up regarding my account - be assured pixupl will do everything possible within its means too provide best customer service support available out there :).