I have never owned a PX4. I know a lot of people who really like them and feel they are underrated. Then there are the people who generally hate Berettas and complain about the slide mounted safety/decocker.
I do have three Cougars, two Berettas and a Stoeger in three different calibers and they all shoot very well and have been completely reliable. The Cougar was in a sense the predecessor to the PX4 and has the same rotary barrel lock up mechanism. Whether it is due to the rotary barrel design or in spite of it, I find all of my Cougars (9mm, .40 caliber, and .45 caliber) to be soft shooting.
I don't know what model you have (F, G, or D). The D model is a DAO so yours must be an F (safety/decocker) or a G (decocker only, no safety).
If you have an F and you want to convert it to a G model you can do so with no extra parts. There is a thread on the beretta forum showing you how. If you want a G model and don't like the "bat wings" on the decocker lever that stick out from the frame, you can buy a stealth decocker lever from Beretta.