It is important to fully test a managed service before moving forward with a new vendor. You can use the following spreadsheet to know what to test and how to test it.
Aiven PostgreSQL Proof Of Concept Checklist
The linked document includes the following sections:
Functionality Testing
Migration
Performance Testing
Operations and Management
Integrations
Billing
Make a copy of the document to keep track of your Postgres POC phase. Aiven is happy to collaborate with you during your evaluation phase and answer any questions. Reach out to sales@aiven.io with any questions or to set up a call with a solutions architect.