Reviews say that they have very very good, but not record breaking energy return and shock absorption. But what they are is insanely light at sub 100g.
Like the number one endurance runner in the world will get a minute off their marathon time because a shoe manufacturer spent $1M making custom shoes for that athlete which don't even have a size they're just "For this one specific person, now" but then some guy on Reddit wants better shoes because he's sure his four hour marathon would have been "more like three" if he had those elite shoes instead of the $100 Nikes he wore...