You will love the PX4. Just make sure to clean and oil the gun before your first range trip.
Also, for some reason, every PX4 9mm mag I have gotten NEW - the follower seems to stick the first time ya load it, unless you disassemble the mag and just wipe down the inside of it. Reassemble, and it doesn't happen. I just use an old wrap that I keep in my range bag. I don't ad any oil other than what's built up on the rag over years