I have raced in the VF 4% fly-knit then I tried the Saucony Endorphin Pro 2 and then the VF next% 2.
The VF4% was a game changer and felt great-responsive, poppy, cushioned, etc. The Endo Pro 2 was alright, but significantly heavier. the Next% feel unresponsive, like I can't sprint in them, or a feeling of "sinking."
Honestly I don't care for the Next%2 and I've heard great things about the Endo Pro 3. Has anyone tried both and what would you race in?