I was hesitant about buying this shoe because I have very wide feet.  I ordered a half size larger and they fit great out of the box.  There was no break-in period.  My first hike was a steep, rocky, climb in the central Cascades.  Loose rocks, wet rocks, it didn't matter.  These shoes do not slip and have superb traction.  After a 7 hour hike (there and back), I had no blisters at all.  I'm giving it 4 stars instead of 5 because a wider toe box would have been nice.  On the way back downhill, my toes were taking a beating and it was quite painful.  That's going to happen going downhill, but these seem to be a little worse in that regard than my usual Keen's.