Go to the FAST site, click on software updates and there is the link for the XFI demo there.
I just installed the system and on the surface it's basically the same. In between and underneath the surface it's a lot more feature laden. Just having the ability to really expand the screens while tuning is MUCH easier on my 40 something year old eyes.
Plus the platform will allow for a ton of upgrading over the years whereas the old box was maxed out.