Ext JS offers a rich component library for building feature-rich user interfaces quickly. It ensures cross-browser compatibility, reducing the need for browser-specific fixes. The MVC architecture promotes code organization and reusability. Extensive documentation and community support facilitate problem-solving and learning. Powerful data handling capabilities simplify data integration and management. Built-in responsive design features enhance the user experience across different devices and screen sizes. Review collected by and hosted on G2.com.

Ext JS's extensive use of JavaScript and DOM manipulation can occasionally impact performance. Developers need to employ careful optimization techniques and coding practices to ensure optimal performance, particularly in complex applications. While Ext JS offers a wide range of components, customization beyond the provided options can be challenging. Developers may have to work within the framework's constraints, limiting certain design or functionality choices. Review collected by and hosted on G2.com.