My dad actually has a few tango down ones that look VERY similar to these. I handled them and they felt cheap, but I never used them. By that point I had plenty of p mags. I agree that there might someday be something better, but without changing the design of the mag (and even changing the design of the gun they fit in), you can only engineer one design so much.
I don't make the rules. I just think them up and write them down.