ComfyUI-Copilot is highly praised for simplifying the use of ComfyUI, making it more accessible and efficient for users. It is particularly beneficial for beginners, offering node suggestions and workflow assistance. Users appreciate its ability to streamline complex tasks and enhance productivity. The makers of commend ComfyUI for enabling sustainable local experimentation with open-source models. Overall, ComfyUI-Copilot is seen as a valuable tool for improving the ComfyUI experience.