Reviewers mostly praise Untitled UI for polished design and workflow fit: users say the icon set is clean, modern, varied, and often becomes a core part of their design work, while one detailed review says the Figma kit and React library stay closely aligned, making handoff to code smoother. That same reviewer also notes practical issues: a few components differ between Figma and React, some markup can clash with app layouts, and the CLI has rough edges around search limits and theme file overwrites during upgrades.