With magazines, I have found very little difference in the way any of the "premium" magazines function. With my 1911 or Beretta I have found that if I spend $25.00 or so on a brand name magazine they all seem to work equally as well, because they function perfectly.
The opposite is equally true. I have bought cheap magazines for my 1911 and while they do function most of the time, that is not good enough for serious business. With every magazine I own I mark the bottom with fingernail polish either "P" for practice only, or "D" (defensive) based on their individual performance on the range. Regardless of the brand, every magazine is performance is tested before it leaves the house on my hip.
My "P" marked magazines also have some range training value when they malfunction. I use them in my CCW classes. I like it when a student gets a jam, or failure to feed, it tells me if they paid attention in the classroom.