I have cablecard. I heard a lot about SDV (switched digital video) being inaccessible for cablecard. So far, almost none of the channels use it on CV. The Cablecard gets everthing except PPV for me. That is not to say that CV cannot change things, at some point. My only comment on cablecard is that the cards themselves are not-so-well understood by the installers. I think that I could have retained my PIP functions if-only the guy knew more about Multistream cards. He also had 'non-working cards', so ensure that they come with enough cards. Don't assume that you can move the card to other devices (or keep it in this device and move it to another part of town), because the cablecard security won't support that.
Good Luck!