I've been running in these shoes for about 4 months now. They're extremely comfortable, and I love them for treadmill workouts and road runs (even long ones). The Flyknit material and midsole are more durable than I expected.
However, a big gripe I have with these shoes is the noise they make. Fresh out of the box I noticed a loud squeaking/rubbing sound when I walked in them, regardless of the surface. I chalked it up to them being new, but after 4 months of very regular use the sound persists. As I result I do not wear them casually in public, and probably will not purchase another pair.