I haven't used this yet but I set it up and tried it out when I found this review request in my inbox. It seems to fit 1911 .45 ACP single stack magazines exactly. I thought it was listed as for 9mm. I needed it for .380. It can be adjusted down for the .380/9mm diameter. Quality seems to be fine. I just now adjusted it for and put it on with two .45 mags and it seems quite comfortable and secure. In law enforcement I had people try to get my gun a lot and so security is an issue that I consider. I will likely buy another one so I can keep one set up for .380 and one for .45. I think the adjusting screw might get loose if I crank it back and forth a lot. I have applied for CCW permit and have ordered a CCW type holster and am waiting on both or might be able to give you better info. But, I have had good results with Uncle Mikes products in the past. I reviewed this based on the representations made in the product description, not for what another product is, so five stars all around.
Pros: Seems secure and comfortable.
Cons: Seems to be primarily for single stack .45 ACP mags.
This review was written in the old system and had content requirements that are different than reviews written today.