Saw that hexmag was making a G17 mag so I got one to test out. The magpul and ETS mags don't work with steel case ammo very well, so they're not viable alternatives for me. The hexmag is built the same as the OEM with a plastic shell and a metal liner. The witness holes are amusing and the little textured part where your finger rests during a reload is interesting. The red follower does make it easy to see where it's at (important for checking that mags are loaded to production division capacity for those who do that sort of thing). First range session was mostly testing on something else so I only got 90 rounds through the mag between an actual Glock and my Ruger carbine. So far it's worked with steel case wolf and locks the slide open on the pistol and rifle. I'll be putting this into my normal mag rotation and see how it holds up over time and how quickly it stops working. The ETS and magpul were pretty fast to fail; won't take much for this one to pass those.