I got the holster from a member on this site actually, and I got it more because I needed a belt holster than anything else. It was a good price, it was available, it was for my gun, I needed it, so I bought it. I bought the holster more for the holster than for the fact that it has a mag pouch built in.
I was neither here nor there about it until I tried practicing from it and using it.
I was a LITTLE worried that the mag would get in the way when drawing but I was surprised to find that I had no problem at all clearing the magazine when I drew my gun.
Secondly, I was worried that I wouldn't like the mag pouch and wouldn't be able to do quick mag changes... Also (surprisingly) not true.
First, see the direction the magazine is pointed? It's kind of "backwards" but you'll understand why after seeing the pictures...
When I perform a mag change I reach across my body and grip the magazine naturally...
That way, when I pull the magazine from the pouch it is in the perfect position in my hand to be inserted into my gun..
I HAVE put the magazine in the pouch the other way only to almost put the magazine in the gun backwards when performing a mag change while on the move and rapid firing at 10 yards. It was very embarrassing, especially when I ended up dropping the magazine and needlessly fumbling with the gun and the magazine, taking my eyes off of the target.
I am getting the exact same belt holster without the mag pouch, and going to use my spare mag pouch on my weak side at times, but I don't think I'm going to be getting rid of this holster set up for awhile.
I'm actually right on the fence as to deciding whether I like it more than the traditional mag pouch on the weak hand side.
I have found that cover garments can be a problem in drawing like they can be for everyone, but when I'm reaching across my body and into my shirt to retrieve my spare mag instead of reaching back and trying to push back a cover garment, my mag changes are smoother.
I do fine with both and I'm happy with both and that is why I'm on the fence as to which I would choose over the other.
This system is like any other. Once you get used to it, it works fine.