Generally I've found Hilton Yam's advice on magazines to be spot on. Here's a link to the article.
Consistent with Yam's article, I found my Wilson 47Ds lost spring strength fairly quickly, and they were inconsistent in locking back the slide on my Springfield Armory 1911. I've had much more consistent results with the CMC Powermags. At this point, all of my remaining 47s have been upgraded with the Tripp Super 7 kit, and are (now) very reliable.
Were I buying additional magazines today, I'd purchase additional CMCs or Wilson ETMs per Yam's advice.
“Shooting a gun projects your personal will across time and space in a flash. I want to hit that and that is hit. Straight from your mind to the physical world. Talk about your PowerPoint presentations.” --Don Winslow, Savages
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