We have an in-house PPC team and we were never able to get similar ROAS effect as Criteo is providing. Account managers are also very helpful - last year we had the idea to use criteo for some specific action and our account manager help us to set-up everything and later sends report about how it affected performance Review collected by and hosted on G2.com.
We don't know where are our ads are shown also there is a gap between what criteo and FB,GA is showing in terms of revenue attribution Review collected by and hosted on G2.com.