1. We've released a codemod when releasing v3 and allowed users to upgrade easily from v2 to v3 and we're planning to do the same for v4 as well. https://refine.dev/docs/migration-guide/
2. We got a similar question before. You can check it out here: https://github.com/refinedev/refine/discussions/3261
3. We have detailed comparison table for similar tools: https://refine.dev/docs/comparison/
Have you ever tried similar tools for building a CRUD app before? Can you suggest any for us to take a look?