I don't use them either. I have read with some work you can make them reliable (see GT) but they will only use them for range mags, not for SD carry. I myself do not want to sort my mags. I want to grab and go and not think if I grabbed the right mags or the wrong mags. Some mark range mag only, but to me the only time I mark a mag is if I suspect a problem with a mag. You can never go wrong with Glock mags period IMO