Took my 14 year old from LAX=PHL-MAN over Christmas (EPL trip)...surprised him with business class...he was thrilled. (used 110K points)
Took coach back from CDG...first time on a 787 and really liked it. We were both fine, though my back hurt the next day from either the 10 hour flight or the really bumpy ride from DFW-LAX on a ratty old 321.
I still remember flying back in first when I was 15 or so on Pan Am from FRA-JFK over 40 years ago...