Bandwidth savings - You can expect ASPX pages to be reduced to about 1/3 of the size.
Fast page loading - The major delay in loading pages is the time taken to transfer the HTML from the server to the browser. So a page light on graphics may load 3 times more quickly. Even graphics heavy pages will load their basic layout faster.
Configured per site - Access to the IIS manager is not required.
Web service response compression
