The customer service has been great! They have always responded quickly to our questions or issues that we've had with their product usage/integration into other systems as well as troubleshooting any compatibility problems between two different products they use in tandem (iCloud & Firebase).
I'm not sure what else really needs adding here - it's just how easy this integration of services was once you knew where everything needed pointing at eachother. We're able solve some very specific challenges around employee information management using these platforms together.