I bought a pair of these. After two runs I sent them back. They're totally freakish, and a total unfair advantage. you can't compare them to VaporFlys, let alone any other competitor's shoe. Improving on shoe design is fine and welcomed, but these are optimized for maximum trampoline effect and to last no more than one race.These world records are approaching Barry Bonds territory; it's no surprise that Keira d'Amato keeps turning in incredible performances wearing the same shoes.
And before you say "anyone can wear them", no they can't. These shoes are built to serve the airpods and the midsole is quite narrow, meaning you have to have a very specific foot shape to have them work for you in a race. They're customized for Eliud to run WRs in, and that's why so many of the other elites are sticking with VFs.
He's the greatest marathoner ever, but these WRs are mechanical, not human.