Notice I didn't say just "work boots" - I'd wear the Sullivans even when I'm not working or even need boots for that matter.
I divide my time between my office and warehouse so the combination of a safety toe and all-day comfort is a must, and the Sullivans absolutely deliver. I have a pair of steel-toe construction "sneakers" from another brand, but they're heavy and actually less comfortable by comparison. The Sullivans are super comfortable, the composite toe offers required protection without weighing a ton, and their construction offers the right amount of durability, support and stabilization.
The day after I purchased them, we had our first snowstorm of the season, and they offered the ideal combination or warmth, waterproofing and traction while shoveling out.
Finally, the dark brown just looks great and shows wear really well.
Regarding fit, I'm tend to be between sizes, so I bought the larger size. The adjust able fit provided by the Brunt insole system works well.