I'm pretty locally competitive. However, it is apparent that the VP4% is giving others an advantage. People who I have easily beaten, and follow on Strava (ie no changes to their training) are all of a sudden much faster times in all distances 5K to 10K (15 to 20 sec/ mile faster). Many of these guys prior to the VP have stagnated in performances with the only clear variable is the shoe.
I was so anti-VP, but I'm going to grab a pair of these to level up the field, where the top local guys (70+% are wearing them)