I like them a lot. They do feel a bit too squishy and "high-up" for the first hundred or so miles, then they really start to feel good. I have about 800 miles on mine and will run in them a little longer. Something weird about them that I noticed is that even though I have flat feet, I supinate in these. Nearly every other lighter weight shoe causes me to overpronate, which results in shin or other issues.
Like others have mentioned, it's really easy to strike with your midfoot in these. I run everything except really fast workouts in them and will get another pair soon.