Holstes with mag holders seem like a good idea but aren't.
When you have to reload, the mag holder being on the holster side forces you to switch hands to access the mag (unles s you're wearing it cross-draw style.) In a real-life situation, that's NOT what you want to do.
Also, I can't tell by looking at the holster, but I prefer something that is firmer -- so that it stays open when the gun is pulled. That holster MIGHT collapse when the gun is drawn. That makes it harder to reholster the gun.
Cheap holsters always end up in a box, unused....