Velcro
While I agree that the velcro pocket closures can be a PITA, I've heard it argued that if you're close enough to the enemy for them to hear it, the LAST thing one should be doing is digging around in one's pockets.
Mine aren't reproductions, they're factory seconds. My top has a cosmetic flaw in the weave of the fabric, but I can't figure out what stopped my trousers from passing QA. The fabric is EXTREMELY light, so I do anticipate durability issues with them.
Still, I wouldn't go so far as "usesless." And they do seem less chafe-inducing than BDU's.
Peace,
Hans