This study examined the effects of e-banking system on customers' satisfaction in Nigerian banks and most importantly the quoted banks. The specific objectives were to examine the extent to which electronic banking system has impacted on the banking habit of customers, to determine the relationship between quality of electronic banking service delivery and customer satisfaction as well as to examine if any difference exists in customer satisfaction with electronic banking service delivery in quoted banks. Data were collected using questionnaire administered on 230 customers of 15 quoted banks randomly selected from quoted banks in Lagos State, Nigeria. Multiple Regression and Kruskal-Wallis ANOVA were used to determine the relationship between quality of electronic banking service delivery and customer satisfaction, and to examine if any difference exists in customer satisfaction with electronic banking service delivery in those selected banks. The study concluded that an e-banking service has significance effects on banking habit of customer; there is significant relationship between identified variables and customer satisfaction