The upper is so much better as compared to the Fly Knits. Much more breathable, good room in the fore foot, and it locks down nicely. Grip on wet surfaces is great, energy return is excellent. They are on the heavier side, but I use them for training runs. Really excited to have these in the rotation, I'm always happy when I have to put them on. I would not recommend them for a racing shoe just because of weight, but I never have trouble picking up the pace. Some stats to help you figure out if my review applies to you... I typically train in the 6:30 to 8:30 per mile range. I weigh 170. I generally strike mid-foot to fore-foot. Average Cadence for me is 175 to 200 (depending upon pace). I have feet that are a little bit wide (I buy D and 2E shoes, depending upon the exact fit, 4E are too wide for me generally). I'm running on roads a lot. 40ish miles a week, distances between 10k and half marathon.

I've owned four pairs of the Zoom Fly Flyknits and loved them all. Eight other runners in my club switched to them on my recommendation and love them as well. When I saw they were being replaced by the Zoom Fly 3, I was excited to see how they could improve on an already spectacular shoe. Sadly, I was greatly disappointed. Despite ordering my usual half size up, they were oddly tight in the toe box and loose in the heel no matter the lacing pattern used. The new lacing system adds a firmer plastic/rubber textured box that pinches and rubs, especially compared to the glove-like fit of the Flyknit upper. The Vaporweave is also hot. It doesn't breathe well and is somewhat flimsy, giving the shoe a clunkier feel than the previous iteration. The cushioning and sole are on par with that of the previous model though it does feel slightly heavier and a tad less responsive. The 3's seem to bring back those elements I disliked in the first Zoom Fly's. All in all I'm a sure it's a decent shoe. However, seeing that it's in a higher price category than most shoes, and in comparison to its predecessor, it fails to meet expectations. I'll be returning these and stocking up on the Flyknits before they are gone. I saw that the Next% has an option to replace the Vaporweave with a Flyknit upper. This option would bring me back to give it another try.

I have all the versions of Zoom Fly and these are by far the least comfortable. Very heavy or full in the front of the shoe and seem wide as well. I ran my Zoom Fly 1's and Zoom Fly SP's out after about 350 miles and currently running with these and Zoom Flyknit. Flyknit are by far more comfortable. I use and insole and these just are too much in the ball of foot and toe areas. Heal comes up easily as well. Just not a fan.