I've got a CSS 11506 and am supposed to be planning the refresh of this device in the future to something that will support IPv6 and do everything the CSS does.
I'd originally planned for the ACE module, but I now see there is a Content Switching Module with SSL available.
I can't tell any difference in what they do based on the limited data on the web. Do either of them support IPv6 if used with a Sup720? Will one of them have a longer life than the other?