I've only done about 6 hours in the 8s so far and there are somethings I like, but also understand the problems others might be having.
I think the narrow feeling is coming from the tongue and new lacing. They added another fabric inner (that starts right away at the bottom) to hold the straps and another that holds the tongue and starts earlier then the 7s. with the 7's they connect higher. also anyone notice the 8s tongue is just a little thinner then the 7s so the top of your feet might get sore rubbing into straps across the top.
If you have any type of ankle discomfort- the cuts are a little different so that might be the cause.
I have spenco insoles in all my shoes and even then my feet feel sore after a couple hours and into the next day right along the long tendon of the foot. I think that's because of the low feel, which I actually like because it reminds me of the 5s.
I feel faster in them and like some have said - they feel way lighter. I like looking down and seeing a different look/shape with the dynawall, but also cool to see the trademark star pattern in the toe we all think of when we think resolution.
other then that I'll keep at them, I really like them a lot and will probably pick up color ways that I'm into.