The Customer Satisfaction Index is a critical filter for assessing the quality of service provided by prop firms from the perspective of their clients. This index, scientifically derived, is calculated based on client feedback, support quality, response times, and overall user experience. A high customer satisfaction index indicates that the firm excels in meeting client needs and expectations, providing excellent support and services. For prop traders, this filter is immensely important as it ensures they are working with firms who offer outstanding customer service and a user-friendly experience, crucial for maintaining smooth and efficient trading operations.