While "extra quality" is not a standard technical term in the jailbreaking community, it generally refers to high-performance repos and optimized modern installers. If you are looking to enhance your jailbreak experience, the transition from the classic to the modern Sileo is the most significant step you can take. The Evolution: From Cydia to Sileo
From these repos, search and install:
One high-quality Installer-focused repo worth adding to Sileo is: cydia installer repo sileo extra quality
Several factors contribute to the pursuit of extra quality: Cydia While "extra quality" is not a standard