The Nike Vaporfly 4% Really Is 4% "Faster"!

Now that this shoe has been out for a bit, what are people’s opinions? Run is my weakest leg and while I don’t like paying for speed, are people finding it’s worth the $250 price tag for the gains? I do sprint/oly/half distances paced mid-6/hi-6/mid-7. I’m probably a midfoot striker shading towards the heel. Also, as not to burn through a $250 pair of shoes, what would you suggest training in if you want to save the 4% for races? Pegasus? Any other neutral shoe with similar drop? I’ve been wearing Asics for 5 years after switching from the old Nike Air Zoom.

Runs gains can be significant time especially if efficiency is better. Thanks for any advice.
The number 4% basically refers to economy gained, not net improvement.

The Zoom Fly Flyknit would be that shoe (the one with carbon plate and react foam midsole). Do try it first though. To me the unstable+narrow heel and narrow toebox are enough to dissuade me. The 10mm drop I could probably live with but only at speed.