Only the lie-flats
I loved United's new lie flats, I must say. The domestic flights are fine, nothign terribly special. Even the doemstic first is not so impressive. I think I get just as much leg room (if not more) in an E+ exit row as a domestic first with somebody leaned back all the way.
However, those lie flats are just awesome. I will fly those whenever I can. You just lay there, watch your shows or movies, eat, drink, and sleep with everything at your fingertips. You don't have to do anything except go to the restroom. What could be more awesome than that?