I have a .40 sub compact. I love it. Still new. Only 30-40 rounds. I went to shoot my SIG Scorpion and my PX4 tagged along.
I let another shooter fire the first shots. I wanted a good shot to shoot it first so I wouldn't think I was shooting left, low, or whatever. He shot a pattern of 4 shots barley a little larger than a quarter. (.25) He put it down and said he loved it.
My groups weren't half as tight as his but I did enjoy shooting it!
The sub compact models only differ from the full size in that they (sub compact models) do not use a rotating barrel. It's a little beefy for it size but the PX4 sub compact is all buisness. Full size as well was just as nice to shoot. I shot a full size .40 F model or constant action.
If you end up getting one, you will be very happy
Loyalty can't be bought at any price;
but it can be rented remarkably cheaply.