I've got two 5.11 Vests (khaki and OD) and I like them. My wife calls them the "wearable diaper bag" because of the bottle pockets in the back. Needless to say, I'm not amused. Anyway, the vests work well to conceal a handgun, but don't always fit the "dress" of the day.
I find the internal concealment pockets to be totally useless. I've removed the velcro panels entirely, mostly because they add stiffness to the front of the vest that makes drawing a gun on the hip more difficult. I've got the 5.11 pouches (made by BHI) that go inside, but when used, they just make the vest look too bulky. Also, any handgun carried in these pockets that weights more than 16 oz fully loaded flops around a lot. I know they show a vest with a 1911 coming out of the concealement pocket, but I can say from experience that is totally unrealistic.
On the left side lowe pocket, there are loops for 3 handgun magazines. The problem is the loops are only near the top, and there is nothing near the bottom to help hold them in. For my 1911 mags, they are held so loosely that after a few minutes, they are just rattling around loosely in the pocket. I need to figure out a way to fix that.
Other than my friends, I don't see very many 5.11 vests at all. I've seen a few from other sources, but also rarely. Given that, most of the sheeple and criminal element where I live won't notice the vest. The cops may or may not either.