I work at a zoo so I've put a lot of mileage on these boots in all sorts of conditions. Rain, snow, mud, muck, gravel, and who knows what else. My first pair lasted a little over a year of constant use. I was in these 40 hours every week, sometimes more. The Gore-Tex waterproofing held up throughout that time and I couldn't be happier in that aspect. They are also very comfortable to wear and I found I needed no break-in period with them. They are decently warm with a pair of wool socks, but are not good on icy surfaces. The boot itself also started to break where you would bend your toes. I bought a second pair and had the same result of the boot splitting at the toe, but this time I was only in them for about 7 months. This crack was worse than the first since it ruined the waterproof integrity.
I suppose these would be good for light work, but they certainly do not hold up to extreme working conditions or constant use.