We’ve been working with AdPlus for both Display and Video ads specially Outstream video ad formats.
They are definitely a premium network. It took a few days to get all our sites approved but overall great experience. Their performance is much better than all other ad networks that we tried so far.
They are also a Google partner (through Google MCM program) and provide AdX and Open Bidding demands in addition to their direct demands.
Great experience so far!