I just bought the PPX. It is a nice pistol. It shoots great but for the $200 diff I wish I would have went with the PPQ. The barrel is closer to your hand which allows for less recoil.
Lonewolf,, I also have the PPQ in .40 s&W. As others have said the trigger has a smooth and even trigger pull and a nice very short and crisp reset. As for Daily carry it's the only one that I have so I can't judge it against others of the same size. As for holster's I use a outside the waistband paddle holster from imi. here's the link IMI-Z1350-Walther PPQ Polymer Retention Holster I have yet to have a problem with this holster or the PPQ.
The only draw back to the PPQ I think is the plastic front sight post, About a month after I bought mine, My wife thought she would try and puch my into our pool and instead she ended up dislodging it from my belt. Thus it went into the pool holster and all, breaking the front sight post retaining screw and losing the front sight. However I can also say that even with out a front sight post the gun is still accurate with out it.
I've recently become interested in the PPX and PPQ's. The PPX has a rather large slide but it feels great in the hands. PPQ is a very nice gun, I've not dry fired either. If I were to pick up a another conceal carry 9mm striker fired, for the price, I'd go with a PPQ.
ZX had the PPX's for $439 or $469 at the 1500. Very very tempting.
I have the P22 (.22LR) and the PPQ (9MM). Love them both. Don't carry either. Got both at Plainfield Shooting Supply. Call John over there and he can help you out.