I do not own one but one of my inlaws does and has let me shoot it. I don't normally like berettas(too many sour experiences with the M9), 40 cals, and DA/SA guns in general but I loved the PX4 in 40. light recoil, very accurate, fit my hands like a glove(you may be different though). it's his EDC and he's on both the local fire dept and search and rescue team so I would image that it gets pretty nasty and he claims it's never failed. he's never lied to me about anything else so I have no reason not to believe him when it comes to guns.
I know this is mostly a 3rd person review but hopefully it still helps.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the stuff people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin