I've been wearing the boots daily for about a month now.  My problem with my previous pair of boots was that the laces started to fray on day one and broke after a week and that the seam on either side of the boot broke on both boots at about 50% of boot wear.  So far no issues with the Carhartt laces and I bought them because they do not have a seam on the side of the toe.  Time will tell on the durability otherwise but so far so good.

Comfort I'd give about 7 out of 10.  Not much in the way of arch support and not much in the way of a cushioned walk.

One concern I have is that the leather is very soft.  The first time it was 'scratched' my metal, it cut the leather half of the thickness deep.

Still, I like the boot enough that I already picked up another pair.