What he said. 1911's seem more prone to mag failure, in part I suspect because there are lots of manufacturers and not all of them are stellar.I've never had a magazine fail or cause a malfunction with a Glock. I keep hearing people talking like magazines fail every other time you pull the trigger. If that is the case get rid of that gun and buy something reliable.
I've personally never seen a mag fail in competition. Typically they start giving problems at the range and are replaced if that happens.