Just returned from the range after firing my new Gen 4 G17. Went through about 150 rounds or so without a hitch. Not one FTE or any other feeding problem. Most were my own handloads that have MV ~1075 fps with a 124 gr plated or JHP. I shot both bullets. Also shot 20 or so rounds of WWB to check. Did notice that on last round in mag I got "boinked" on the top of my head with the ejected case a couple of times. I also tried some Korean G17 mags. No problems. These are mags without any mfg marking in the square on the bottom. I have others for my G19 that were made by KCI and they work great also. My G17 was made (test fired) 2/17/10 for what ever that is worth. My only issue is that this pistol shoots 1 1/2" left. My other two Glocks, G19 and G23 shoot to point of aim at 15 yards. This is a minor problem and given I plan to change sights anyway will be solved at that point. So for those of you considering a Gen 4 Glock - Go For IT!