I have, a flight from LA to Amsterdam. I was rather lucky. I had to fly by myself right on newyear which is a time not many people are flying so they had an almost completely empty firstclass and when I asked, they said an upgrade was just a little more than my ticket so since it was a 12h-ish flight I took the opportunity ;D First and last time I actually slept fine on an aircraft
Never have I ever made a ridiculous purchase that I didn't need but bought anyway.