i have a sony xbr 120hz "motion flow". No, makes no difference that i can really see. i tried watching racing, switching between on/off and i didn't really notice anything.
same with gaming. i think it was yet another marketing thing. maybe a real 120hz tv would be better?
how about a plasma? should be found for cheaper. i got a 42" LG Plasma for my bedroom cheaper than that tv.
Hexen was just a crappy doom clone with level designs that defy all common sense and logic to an infrastructure in a poor effort to do little more than provide a false sense of exploration in what is nothing more than lots of boxed rooms put together from some guy drawing squares on grid paper before creating it in the engine editor..... like most old 3d games did. If you tried to build such in real life, more than half the infrastructure would completely collapse in on itself.