I just got my first pair of iron rangers last month, I got the rough-and-tough copper color. I'm actually selling my 10Ds after wearing them ~30 times because they run just a bit large (something I'd have avoided if I'd read this thread completely first.) I wore my steel toe redwing work boots for a few years, loved them, but knew they just weren't quite nice enough to wear as "nice casual." The iron rangers are perfect for this.
I just got my 9.5's, I think they're going to work out well. I wish they made these in a B-width, but I'll take what I can get. Below is a picture of the 10Ds, worn 30 times, and for color reference note that these have been treated first with the leather oil and then the protectant (both Obenauf's.) The 9.5's I just got are much lighter out of the box.
+ vote to the person who said these look best beat up. The leather wears naturally, it's unique. Find me a left and right whose leather matches. Mine are totally different but they still somehow match. With time, shoes weather and get a look to them that has a history.
If uniform is what you want you might like the Amber Harness better than the Rough-and-Tough Copper, there's something for every preference I'm sure.