Order Info on Success Page

Module adds Order Information on success page. You can print and View Order information

So basically after order is compeleted customer will see order information (Shipping &Billing Address, Shipping method, Payment information and items information) and at the top if the page will be print link. See screenshots for more detail view.

Make sure that you have compilation disabled before installing extension. System > Tools > Compilation page and click on Disable button. After Installation you can enable compilation back.