I've got the 9mm CX4, a PC9 with the shrouded barrel, a Rossi 92 in 357, and a Hi-Point in .45.
As much as I really want a carbine in .45 ACP the Hi Point just doesn't do it for me because it doesn't feel good to hold or shoot. Being a lefty probably has a bit to do with this, but it feels cheap, large, heavy, with cumbersome controls and a trigger which -- unique to all the guns I own -- digs straight into the pad of my index finger.
I used to think the CX4 was horrifically ugly, but when I picked it up and shouldered it I was pleased right away and bought it on the spot. Now my thoughts have evolved and I feel like beauty is as beauty does and I actually think it is quite attractively styled. It definitely doesn't feel cheap or flimsy at all to me, except perhaps for the little section of rail that is supposed to pop out from the front of the stock. The new Berettas in their field dark earth or whatever it is called look arguably even nicer than the all-black one I have. If I didn't already have one I would probably buy a newer one. The price just is what it is. I'd say pick it up and shoulder it and if you fall in love there's your answer.
The Ruger is much heavier and bulkier, and feels much more like a rifle than the short, almost submachinegun-like CX4. Heavier than it ought to be, but it is also obviously a quality firearm and shoots great and I don't regret my purchase at all. It's got nice winged ghost-ring sights. I got the shrouded barrel because I just did, but wouldn't turn up my nose at the standard-stocked one either.
Haven't tricked either of these out with red dots or flashlights but both carbines will probably end up with them eventually. I'd really like to upgrade the CX-4 with Sierra Papa too.
The Rossi '92 clone is great too. Really slim and a delight to hold and shoot. Mine is one of the newer ones made by CBC, and seems very nicely made. .357 so I can choose whatever I want for my handloads. No plans for lights or red dots on that one. Even the buckhorn sights are OK for now.