I Have One
+1 on SuperNaut.
I have a CX4-9. I also have a Marlin Camp 9. They both hit coke bottles nearly every time at 50 yards. The Marlin is really for outdoor use. The CX4 has been designed for closer quarters.
The CX4 has better ergonomics up close. It's shorter, lighter, balances farther back, has a front rail for light/laser, can be fired one-handed, fired from the hip, and with wide open sights it acquires very quickly at distances < 20 yards.
(
Wide open sights: the rear sight has three positions, long range (peep), short range (peep), and wide open -- where you're looking through a gap a half-inch wide to the front sight.)
In my house, the only places I'd have trouble with it would be the smaller bedrooms and bathrooms. I have nearly 60 unobstructed feet from my bedroom door to the front door, and 20-to-30 foot areas in most other areas.
Although intimidation is not a guaranteed stopper, I know for sure that if I walked in on someone with one of those, I would
put the crowbar down and back away.
And, since you're going to be getting a PX4 in the same calibre
you'll be pleased to note that the current crop of CX4s and PX4s will share not only ammo but also magazines. If you get an older CX4, then the mag well works with the 92 and 96 mags, but they do an adaptor for those which allows using the PX4 mags.
Home defense? Absolutely.
Estate (yard, grounds, soccer pitch) defense? Absolutely.
Personal defense? Would fit nicely in the car's trunk or behind the seat in the truck.
Just fine for CCW, assuming you're nine feet tall and wear baggy pants.