I've seen some reported issues with the AE 5.7x28 ammo in various places online and was a bit hesitant to try it, but I picked some up and tried it out today (with my new knock-off mag) with my PS90. It may not be as accurate as its blue-tipped cousin, but it definitely went bang, fed and ejected without a problem. I can't say for sure how accurate it was, because it was quite windy and I was mostly having fun at that point with some cans and rapid shots on target, but most of the complaints I saw were about FTE/FTF, which I had none of. I'll probably just take the AE rounds with me next time and I'll update this if I run into any issues (admittedly, I only put 50 of them downrange today, but I wasn't looking to reload with as brisk and breezy as it was) after getting more rounds (hopefully, more mags to assist with the process) fired. In the meantime, I'll be picking up some more of it for plinking.