I have a few 5.11 products. A while back I bought one of their holster shirts. The spandexy ones. It served its purpose for a couple situations but I don't use it anymore. A couple months ago I bought a pair of 5.11 cargos from LA Police Gear because they had a good deal. $40 for the pants, a belt and a "tactical" bag which is becoming my first-aid kit.
I love the pants, they're the ones with the zipped pocket behind the regular pocket that has small pouches built in meant for magazines. I usually wear polos at work during the summer and will be purchasing a couple more pairs of these pants because they're comfortable, allow me to carry a spare mag in my pocket comfortably, securely and with quick access. They just work good for what I do.
Do I care if someone recognizes that they're 5.11 and thinks I might be carrying? Nope. Chances are if anyone recognizes the brand they probably carry themselves. Nothing about them screams "tacticool."