I'm using this with two Springfield XD-9 magazines. They're not listed, but they fit nicely. I personally like the horizontal carry. The item seems well constructed and the the belt attachement is separate from the magazine cavity insuring easy entry and exit of the magazine. We'll have to see how the belt attachement holds up over a long period of time.
This review was written in the old system and had content requirements that are different than reviews written today.