The team at mobild is very responsive to our needs, they are always available via email or phone if you have any questions! They offer great support with their products as well so there's no worry about working through issues that arise without having someone else in house who can help fix it right away (like we used too do). We've been using them since 2013 but only recently started seeing more revenue from AdMob ads being served by these ad networks than what was coming directly form Google Play - this makes sense because of how much traffic comes into my apps compared to other platforms like Facebook/Instagram which don't give me nearly enough money per user when I'm serving an interstitial between each post.