I've gone out and used it once as just a belt attachment and I have to say that it works perfectly and was exactly what I was needing. 6 mags, I believe, is a good even number so one in the pistol and 5 on standby is enough for any outing. It's easy to get the mags in and out and they fit snugly. My only reservation is that when you insert a mag, it hits the nylon at a 45 degree angle which might create a hole over time. I might try to put some cotton material down each slot to avoid any undue wear by making the pouch a rectangle, but this design flaw is of concern. I'm sure it was made like this to cater to the many types of double-stack mags out there.
So yeah overall I'm very happy with the purchase. I got it from LAPoliceGear when they had their Christmas 15% off sale. Other places that have'em are MidwayUSA and direct from Tuff.
Holds 5 mags as a single unit
Removable Velcro flap
Bottom nylon + stitched angle prone to wear
Even with 15% off, still a bit pricey