Slimline ONLY w/all HD boxes. As I said above, D* has completely stopped installing ANY 72.5 on new installs/moves/upgrades - again, it makes no difference if the sub is SD or HD. And yes, any of his locals that are up in HD, he will ONLY be able to see the HD versions of them. But again, the receivers will just downconvert to SD, & he will be able to adjust whether they will be letterboxed or cropped, to properly fill a 4:3 screen. This is a BIG improvement over those R22's, where you CANNOT make this adjustment! (eg: when any of our HD locals are broadcasting a 4:3 pic w/side bars, & you are trying to watch on a 4:3 TV, you end up getting the "postage stamp" effect on these stations, & NO way to fix it - VERY ANNOYING!)
But also another tidbit - any other of his locals (such as his CW in this case) that are NOT up in HD, D* has put up duplicate SD MPEG4 Ka versions, so that they get EVERY one of their locals via the slimline, whether they are all in HD or not. This applies to ALL Ka markets. In our market, our local CW & MTN stations are not up in HD, but are up in SD MPEG4, so if you do happen to have BOTH a slimline & 72.5 dish, you end up with 2 SD versions of these channels.