So while I'm not exactly user of Lazarus other developer on our humble open source project uses it for our map editor. Screenshots might look dated and ugly, but it's much closer to being working solution for cross-platform desktop applications than many would imagine it to be.

Pros: super easy to serialize data, compilation is fast, easy to avoid crashes.

Cons: version packaged in Debian is far from perfect, some UI bindings are not very stable on macOS for instance.