I've had some mixed experiences. On UA (why am I even surprised), when I flew on a paid upgrade (from Y-something cheap) to Z, I actually was skipped for my choice of meal until last. The guy next to me who was 1K thought it was BS.
On QF, I've never been treated any different, on domestic or international. On our SYD-LAX-SYD trip tis past Christmas we upgraded to J with points. On the SYD-LAX the CSM approached me to advise that my IFE was on the fritz, and offered me several options of new seats (all displacing staff travel). My offer to be sent to F was declined, but they were still very apologetic, and treated us as if they had ruined our trip. Champagne from F was brought to us immediately at our new seats, and throughout the flight. On our return, halfway through the flight, the seat control cable snapped, and my seat had to be manually moved adjusted by the crew. BUT, the legs wouldn't go down, so I could lie flat, or I could sit with my legs straight out in front of me. They offered to move me to F when I woke up (about 3 hours left in flight). They would have had to move a Captain on staff travel, but I said I would be ok. They served me breakfast in the lounge, and the CSM came and chatted me up while I ate. He'd obviously accessed my "permanent record", as he asked if I was still a paramedic (I had helped out with a medical on our way from SYD to HNL on the way to our wedding last Feb). He ended up giving me $500 in duty free vouchers.
Where I was treated differently was at check-in at LAX. We had chosen our seats well in advance, and checked them before we left the hotel for the airport. By the time we arrived at the counter, the agent was "sorry to tell you that we've had to separate you for the flight". Strangely enough, it was for a person traveling solo, with nobody next to him. We called Bulls@#t, but she, her manager, and the lounge staff all REFUSED to move this guy (Im guessing WP?). When we boarded, the CSM sorted it all out though. They guy was happy to move when asked. The excuse we were given at check-in was "you didn't pay for your seat selection, that's extra". It was all sorts of ridiculousness. I complained, and got 1/2 of my points for the upgrade back.
Sorry, what was the question again?