'premium class' on airlines

[octopi]

While researching flights to and from Asia this winter I came across something I had never seen before; premium class. Or, perhaps I had never noticed it before. I'm a scant 5' tall and my boyfriend at 6'3" requested better seating on a plane if we were to be traveling for 20+ hours so I did a bit more indepth research.

In any case, I saw that EVA and Thai offer it most prominently, and the other airlines do as well, but it seems a bitch to get pricing on.

Just wondering if anyone's flown it and if seems like a good choice, or is just a waste of money for a bit more leg room, a pop out leg rest (that may or may not be broken) and a slightly different food selection. I have only ever flown Northwest to Asia so I'm bit nervous to try other airlines out, even if Thai is rising in the ranks.