Reviewers mostly praise Sanity.io for strong developer experience, fast setup, flexible schemas, and deep customization, especially for structured or omnichannel content and client sites. Several call out standout features like Portable Text, image hotspotting, and the ability to shape Studio to fit a project. But the criticism is sharp and specific: plugin support can be uneven, internationalization and TypeScript type generation need work, official examples and core docs feel thin or outdated, and some users report frustrating UI and schema-sync issues that make editing and data reliability painful.