They aren't going to change you to a slimline if you already have a 5lnb dish,Unless it breaks. But if you have a 3lnb dish and need to upgrade to a 5 lnb ,you are getting a slimeline not AT-9.and Any new HD install you will get a slimline.Hemi,
This is the first I have ever heard of this, if they would like to come out and replace the AT-9 with the AU-9 that would be fine, but I doubt thats going to happen any time soon.
Too many call backs from the arm holding the 2 lnbs breaking off.
Jimbo