I work in IT.
I wear them to work, a business casual to business professional environment. I am not required to wear slacks or even Khakis. But I choose to as I have to attend high level meetings on occasion or fix equipment in VP's offices. Dressing nicer than "jeans and a polo" gets you noticed in a good way.

These help me keep my pockets from bulging out with 2 phones, wallet, multiple keys etc. They also seem to be made of durable material.
The only down side is the vertical zipper. It has not failed on the 4 pairs I have, but I can see it failing if your too rough with them. They should have put the zippers from the Covert Cargo's on it. A bit more visible, but those seem to be really durable. It is not enough of a downside to drop a star.