I like how easy it is to use, even if you have no previous experience with ad tech tools! The product has been great as far back that we've used (about 2 years now).
It was only recently when they switched over from Adobe DFP/JDP which caused some issues but not too much hassle once figured out what's going wrong in their system - just make sure your account rep knows everything about your setup so there aren't any surprises along those lines later down time line!! We're running our business off of this tool all day everyday without issue or complaints at current moment.