Went for a run in these after 2 hours of tennis with splits of 7:09, 6:19. 6:47. These really performed when striking and starting with my heel vs. midsole (I am not a technical runner more of a casual one / former college tennis player). I just switched to these from the Zoom Fly 3. They have the same softness / bounce that the earlier Zoom Fly's had but with a premium build / materials. You will notice good ventilation on the top of the shoe on a hot day (ran in 85 degrees in central park).
Some of the critiques: I did notice a subtle rubbing / pinch by my heal which may be break in or could lead to a blister (I laced to the top eye lit and wore low cut running socks. You will notice some subtle instability at times, but that may be par for the course with such an elevated, cushioned shoe. They are a bit narrow (I have an A width foot), but there was no discomfort from this and may be break in. For some of these critiques, I did come right home from 2 hours of tennis and threw these on and ran at a good speed on inclines, declines and some subtle wind through central park.
Overall a more comfortable option to zoom fly 3, but it didn't feel like I could sprint all out as I can in the Zoom Flys.