Fios and Cable Cards
I was one of the first Fios TV subs in my area (Metro Pitt) when it came out. Having been using a tivo with comcast, I wanted to keep my tivo and use the fios cable cards.
When the installer showed up, he admitted he didn't really know how to set them up, but was real cool about it. We worked at it together for the better part of a day, reading through tivo online support notes, comparing them with his internal setup instructions. Well, day one left us with no success, so he tells me he will be back tomorrow with "reinforcements."
The next day he's back with 3 other guys, one of who personally has a tivo with cable cards. They all have a little "class" in my basement on how to set the things up, how to activate the cable cards, ect ect.