The positives:  These shoes are very comfortable.  They feel like I'm wearing really comfortable bedroom slippers, but with rubber soles.  I am enjoying that softness.  I wouldn't recommend if your feet need a lot of firm support -- they're just too soft for that.  There was no "breaking" in required... Comfy right out of the box.  The negatives:  If it is wet out at all, you feel it.  I have now owned these shoes almost 5 months, and I've worn the rubber tread way down, almost gone, so I'm not so sure of the durability. I wouldn't buy them again if it weren't for the fact that they are so darn comfy... so I'm somewhat torn.