Argon has been very good at UI work in my experience, although it can miss business logic.
I recently gave it a theming task in an existing mobile app that only supported dark mode. With one prompt, it added light mode in about ten minutes. It also placed an appearance option in the appropriate part of Settings, letting users choose light mode, dark mode or the phone's system setting. Following the system setting was the default.
The repository already had Contract Graph Dev Kit installed when I ran this task.
The speed and placement of the UI change stood out to me. Business rules still deserve their own review, even when the interface comes together quickly.
This is a personal observation from one task, with an approximate completion time.