Is it marketing BS? Or is it that consumers can't perceive changes?
Hypercarbon/Graphite Xtreme - super stiff, super strong graphite. Allows rackets beams to get thinner while maintaining strength. Reduced chances of strings caving in.
BLX - Its dampening effect is night and day.
Port grommets - sweetspot is HUGE!!!
Cortex - allows a racquet to break faster than expected.
Karophite Black - guaranteed to give you tennis elbow in a month or your money back
Low friction grommets/rounded ends - lets the strings slide with reduced chances of string breakage
...the list goes on and on......
When their tennis really matters, Babolat Reps use a Wilson.