I purchased my px4 (G) last december. I have since put ~5,000 rounds through it during 2 center fire pistol leagues, my ccw class, 2 tactical classes, and a minimum of one trip to the range per week.
it has functioned absolutely flawlessly and the act of shooting it is nothing but a pure joy. I own many other pistols, and tried quite a few others before purchasing the px4. Yet to this date, the px4 is almost surely my favorite pistol on the market.
I have upgraded the sights to trijicons, purchased a good quality laser/tactical light, and bought a few of the 20round 9mm mags. I dont plan on getting rid of it any time soon and i look forward to the day i can retire the glock26 for a px4 sub compact as my concealed carry.