Had MecGars for years...good mags. Only ever had one problem w/ one 1911 .45 mag. The mag was purchased new. It had the old style follower before this newest version. The mag would not hold the slide open on the last round. Also, it would not seat properly. I wrote MecGar a letter telling of the problem. Immediately, they responded for me to send the mag in to them that they would replace it. Not only did they replace it, they paid for shipping as well.
So, yes, they are good magazines and if you ever have a problem w/ one, the company will make it right.
Slabside