I've never had a failure to eject with the pistol. The only issue was FTF with the hornady ammo. I believe has something to do with the conical shape of the bullet, or maybe even the plastic tip. I'm not sure.
Besides the one box of the hornady stuff that I had to load one round at a time to get rid of, I've put 1100 rounds through it with no failures. It's an excellent pistol and I carry it every day loaded with Spear Gold Dots.
I tried too many boxes of the Hornady CD ammo. The issue is that the polymer they use in the tip stops the round on the feed ramp as if it was a brake pad. I think it's the extreme slope of the feed ramp on the PPS that does this.
I even had Walther (S&W at the time) polish the feed ramp, it didn't help. I called Horandy on this and they admitted that this is one of the few pistols that have problems with the Critical Defense ammo. Note, I have not tried the Critical Duty ammo, but I'm guessing it would have the same issue, unless they made the polymer in the tip more 'slippery' and less like the rubber of an eraser (or a 'brake pad' as I call it).
Good luck with the PPS. Get a good holster such as the Comp-Tac and it will dissapear on you and be comfortable for all day wear.