Don't vapormax squeak terribly because of the heal to forefoot transition? Kinda the reason why i don't really want to buy them.
Only when the air bubble bottoms out. Doesn't happen often though.
You probably get similar noise results as continental soles on waxy floors.
What was the difference between the two batches?
Nothing really, just 1 pair being older. I've only noticed that my older prod. date UBs are beginning to lose their 'bounce' vs. newer UBs in the collection.
Eventually I believe if someone finally gets their 1.0 'grail' in the next year or two, it def won't be worth it in terms of comfort.
Currently running a theory that boost can go 'stale' after a while.