Data from the American Customer Satisfaction Index shows that Optimum in 2020 got a customer satisfaction score of 65 out of 100. This was the industry average. Therefore, most of the customers are satisfied with the Optimum services. In comparison with other ISPs, it scored better than Spectrum and fellow Altice service, and Suddenlink. However, it scored less than Verizon Fios, AT&T, and Xfinity.