Better price than RDS, better speed, never worrying about the disk size and needing to plan to scale up, built in data redundancy and restart times of under a minute in the event of a crash (faster than replica failover so you don’t need a replica unless you just really want one).
I miss it. Daily. Took the amount of time I spent on DB maintenance every month from about 5 hours to about 0 hours.
Fully MySQL/PostgreSQL-compatible DBMS with automatic failover across AZs so you get upgrades all the time, fully managed, without ever having downtime. It's really good. Access management can be through IAM.
Like, Google Cloud SQL has 5 minutes of planned downtime every month by design, in comparison, or something.