A pair arrived today. I did 3 miles in them. Interesting feel: like a racing flat with loads of cushioning in front.
Takes a little getting used to, but it's not bad at all. I did run a bit quicker, I'm coming off an extended layoff owing to injuries and family stuff.
Pricey?
Yes. But I was willing to take a chance, what the heck?
I wonder, too: if you took a pair of any brand-name racing flats, remove the original insoles, took 2 sets of extra insoles & sliced them just below the ball of the foot then super glued them to the inside of the shoe at the front, & put the original insoles atop them, would they feel similar to the Newtons?