I bought 4 to couple 8 10rd mags. Quick and easy install. Maybe took me ten minutes only because I was doing things in between. Slimmer profile than others I’ve seen. Love the fact that its only branding is so small I almost didn’t see it. Polymer seems to be just as robust as most or any firearms parts that come in the same material. Honestly hoping they make a different couple that allowed to pair the mags in an asymmetrical configuration so flipping tbe mag would be more ergonomic and some for pistol but other than that dream, I love it. Recommending to everyone I know.