I carry mine sometimes. It is roughly the same size of my Glock 19. I carry it in a Alien Gear 3.0 Cloaktuck and it is very comfortable. I love the PX4 series with the exception of the sub compact model. In my opinion the SC model doesn't bring anything special to the table. The full size and compact guns have the rotating barrel which makes for a very soft shooting gun. The PX4 series finally has some factory support behind it (it only took them 15 years), so you can get better triggers and controls. Sights can be a problem depending on what you like because some manufactures just don't make sights for the PX4 guns. I haven't had any problems finding IWB holsters for it either.
Compared to other compact guns like the G19, M&P, P2000, P30, P320, SP2022, I feel the PX4 is a solid performer. Both of my guns have been nothing but reliable and as for accuracy, it is very accurate. Things I would like to see improved is the finish. Beretta's finish is a bit soft. Adjustable grip panels kind of like you see on the VP9 and P30. I would also like to see a long slide with a compact grip that is optic ready. I wouldn't mind seeing different color frames. I realize it is purely cosmetic but I like having different colors.