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* Initially, the outsole had surprisingly little grip, feeling slick and unsure on anything that isn't a firm surface. After I'd put some miles on them, the grip seemed to improve and was remarkably good, except on gritty asphalt where the grit acts like marbles.
* I found the toe box was not as bad as I expected, though running 20 miles without cutting open the toe box resulted in a minor blister.
Overall, I feel like I'm faster in the Vaporfly than other shoes by a noticeable amount, which is quite astonishing. This is hard to confirm, but my Heart Rate and perceived exertion seem noticeably lower for a given pace and [[Stryd| Stryd Power Estimate]]. On the other hand, I feel like the Vaporfly has a real risk of injury, adding stress on to ankles and knees. After many hours of consideration, and hundreds of miles of running, I've rated the Vaporfly as "best of the best" in spite of its many flaws. It's expensive, almost impossible to find, and risks injury, but it's just so good that I think if you can handle the extra stress, it's just too good to ignoreworth it. {{H:WhatToLookForInShoes}}
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File:Nike Vaporfly 4%-top.jpg|Nike Vaporfly 4% top