Yesterday at the track I met a runner who had multiple shoes and got to try on his Vaporflys. They have too much cushion as it feels like you're walking on clouds, so you're probably getting less traction: the bottoms are smooth too. I feel like I'm about to fall over when wearing the shoes. They're just too bulky and sub-optimal.
What do you think? Are Vaporflys inferior to normal sneakers for a mile race?