I've had this pistol in for about a month and finally put the review up since it's now available to everyone...
Pros:
-0 malfunctions with any ammo to date
-interchangeable frames; the "gun" is the chasis
-good accuracy for a "combat" type pistol
-factory steel sights
-nitrided slide/barrel
-the serrations are very functional albeit the looks of them are in the eye of the beholder
-the grip texture is rough enough to not aggravate you if carrying IWB but not slippery either
-I'd imagine in the future you'd be able to purchase different caliber & size slides/frames and not have to go to the FFL to do so
-Beretta is already offering plenty of accessories for the pistol (threaded barrels, sights, holsters, mags, etc...
-trigger has a very crisp break
Cons:
-at this point it's new so track record is still a question mark
-I'd much prefer the trigger reset to be stronger.
-the striker safety protruding through the slide
may be an issue for milling
Full review:
Beretta APX 9mm Pistol Review (HD)