I personally won't use anything but GLOCK OEM mags but that's just me. The Korean mags mags and now these are definitely less expensive but I won't buy anything that can't be 100% for sure be used for both the range or carry. If I can't trust it for either/both ... I won't risk it to save a couple of bucks. YMMV.
EDIT: I also don't see the need for those super-cap mags. Folks say they use them just for kicks on the range. Sounds like a waste of ammo to me. The balance, etc. is way off and anyone I've ever seen use them just do mag dumps and burn up the ammo.
EDIT2: Sorry that sounded like a sour puss. That wasn't my intention at all.
EDIT: I also don't see the need for those super-cap mags. Folks say they use them just for kicks on the range. Sounds like a waste of ammo to me. The balance, etc. is way off and anyone I've ever seen use them just do mag dumps and burn up the ammo.
EDIT2: Sorry that sounded like a sour puss. That wasn't my intention at all.