I use mine all the time. I carry it in training hikes and during hunts every now and then. I mainly bowhunter so I don't carry a firearm all the time but they'll hold binos really well.
I am not as concerned about concealment as I am about the placement of the revolver/pistol. Having it on your hip sucks with a pack on and putting it on the hip belt of your pack sucks as well. Having it in a little pouch on your chest is pretty handy
Two of the cons from my perspective:
-I don't care for the suspension on them so I modified it. It needs to be 2" of strap vs. 1" of strap to distribute the weight better.
-they are wider than I'd normally like, but it's the only thing that'll carry my Ruger MKIII hunter with a 6" barrel.
I have used the HPG runners kit bag , it is a slimmer profile so not as bulky. it only holds a pistol and alittle more in the front flat zippered pocket. The original will hold more but I didn't want the bulk. It rides very well and the harness system is comfortable.