While you can  covertly carry 30 round magazines in the leg pockets and I have carried an inert hand grenade to work for my secretaries son, what I really like is the room to carry my various tools, notebook, flashlight, pocket knife, wallet and blow out kit while at work.  As a professional computer geek, the right tool is better if it is in my pocket when I need it.  For serious stuff I have to grab my tool kit.  Daily challenges are covered by my pockets full of tools.

When the time comes to grovel on the server room floor to troubleshoot connections or trace cables, the optional neoprene pads fit into knee pockets inside the pant legs.  A little extra padding really helps when kneeling on concrete.  So far, with mostly gentle wear, they are holding up pretty well.  After a few months of use, I continue to be pleased and impressed.

Update - pockets were getting a bit worn where I carry my knife.  One pair had a pocket hole where I carry my flashlight.  Looked up my Amazon order to buy a few more.  Was surprised my current collection was four years old.  Not bad.