I personally like the long skirt follower style magazines that have metal on the slide stop engagement surface. The long skirt follower design stays straight as it rides up and down in the tube and seems to be more consistent in round presentation from first to last. The metal on the slide stop engagement surface is a no brainier if you think about it and it's just a place I don't really want plastic in a gun I use a lot. I had a bad experience with a magazine that is made by a company with one of the best marketing departments in the world. Very good company and I like a lot of their products, just not magazines. Said magazine wore the plastic where it contacts the slide stop enough that it would no longer lock the slide back. I own and use both magazines in this picture with those 2 attributes I mention as well as many others but the 2 brands of magazine I like the best and use in guns that I shoot a lot are those 2. A bit old and not inclusive of a lot of new magazines but a good article to read about magazines here:
http://how-i-did-it.org/magazines/feeding-time.html
