Great boot and great build quality - fits very loose.
I love the look and quality of the boot - 10/10.
However the fit of these boots are BIG. I would recommend NOT sizing up at all.
I wear 9.5 in Nikes/Running shoes and I sized up to 10 (per Quoddy's recommendation). I was SWIMMING in the shoes - they were obnoxiously big. So I exchanged for a Size 9. I thought they would be a bit snug and thought they would fit a lot better - I was wrong. They fit like a normal size 10 Shoe (if not slightly bigger). I need a thick sock and an insole just to make them fit properly.
No idea who is sizing these boots or recommending to size up - that should be taken off the listing.