I picked one of these up a couple of months ago for the purpose of home defense and as a range gun and have put a thousand rounds through it with no hickups. This, with a wide variety of hollow point and FMJ including a hundred rounds of steel cased russian crap.
It is very comfy - could shoot all day - and the PPX has, as others have mentioned, a very smooth, light trigger. Beyond the trigger, being able to see the partially cocked DA hammer move back while easing the take-up, helps accuracy even more, and inspires confidence.
Take-down and cleaning is a snap.
The blocky looks and general feeling that its not a good concealed carry choice are the only things keeping it from being 5 stars.