Installed app 11/14. New google tags were installed within a few days of installing app. Google ads started throwing an error the following day: "Make sure you don't miss any conversions by fixing your global site tag issues. Recommended because your global site tag setup may be incorrect or incomplete" I have emailed the devs 3 times, 11/19, 11/23 and 11/29 and have not received a response, let alone a fix. Nothing in junk mail folder either. Not just poor customer service, completely non-existent customer service. Now we have to hire somebody to go in and clean up the code they left behind.
We tried to install Google Tag Manager App, and after 6 frustrating days we had to uninstall the app to go for an alternative solution. Customer support was poor: hardly responsive, inefficient.