I'm 6'5" 215lb (skinny stick boy) and I've been wearing one pair of these for the last 7 months straight 5 days a week in a veneer manufacturing plant. Every day I'm running stacks of veneer and a lot of it rubs against my shirt and pants as I move it around, but these are still running strong.
Condition after 7 months (over 1000 hours of use): There's a small tear forming in the right pocket where I put my phone, and the zipper pocket snagged and ripped. The crouch seams is starting to show signs of loosening. Hoping to send these in to get these patched up so I can run em into the ground.
Stuff I don't like: the pants are stiff and I always have to hike them up before I kneel down, or they just do not let me kneel. My belt always digs into my belly (it doesn't sit in front of the pants - I've only noticed this issue with 1620 pants. I use the same belt for everything and do not have issues with other pants).
For reference, I was wearing Carhart overalls before these and within 4 months (over 500 hours) I had already torn through the first layer of fabric at my waist (they are double layered). Pretty sure the pocket ripped on those as well from normal wear and tare.