I found that unless there is no choice but to use a after market Mag I do better going to the manufacturer of the gun.
Guns, fishing equipment, Knives......are a some of the things that if I can't afford it I save till I can.
I also read the reviews a product got. I try to make sure I'm not reading a 5-10 year old review, but one that is within the last year.
I used to only buy the German made sig, but the guns that they have put out the last 3-4 years have been very dependable.
I have little interest or faith in a weapon that requires me to fix it so that I can use it.