Works great! Expensive but works on every mag I have, double stack and single stack. So probably saves money if you had to buy a mag holder for each kind of mag you have. Mags do not move with the strong magnets. The pocket spring clip is very stout and it takes a little effort to get it to clip on my pocket. Once clipped it's not going anywhere. Highly recommend.

I've been carrying it for a few days now and my 15 round Glock 22 magazine stays in place in my pocket with no problems. I have the two magnet version and it is working great so far.