The advantages of the Beretta are several, and most of them IMHO have to do with the fact that it was designed as a weapon, not a plinker. It's a lot more manageable and adaptable than any other semiauto pistol caliber carbine I'm familiar with, and does what a user needs a fighting firearm to do.
Why do I say this?
Because a while back, my 80-something mom said that she couldn't manage the recoil from her cut-down 20 gauge double barrel any more, and wanted something else. So we commenced experimenting with pistol caliber carbines in 9mm, with recoil management as the primary issue. We tried a HiPoint because one was handy, just as a proof of concept. It worked OK but was too limited in magazine capacity to suit me.
So next we tried a KelTec Sub2000. Recoil was manageable, but it left a lot to be desired from the standpoint of basic manipulation. Basically, she couldn't run the bolt. So we looked further.
Next in line pricewise was the Storm. I got a decent deal on a 'new, old stock' example, bought a handful of 20-round magazines and spacers, and went to work. She couldn't run the bolt with the charging handle on the left- it was the work of a few seconds to swap it to the right side. Crossbolt safety? She was accustomed to those, no problem there. Iron sights were an issue, she wasn't accustomed to aperture sights, but there was a Trijicon Reflex in the parts box- and she liked it. A TLR-2 on the bottom rail with the laser zeroed at 50 yards and she was all set.
My mom is a typical little old church lady, but she really likes to lock the Storm in under her right arm, put the red dot on a cardboard target that's iluminated with the white light from the TLR-2, and run a magazine into it. And she can hit from the shoulder using the Reflex sight too, out to 50 yards anyway. The Storm works for her, and I feel a lot better with her having it, and enjoying practice with it.
Only problem is my wife wants one too, but she's willing to admit she doesn't need one as long as she can handle her shotgun or AR carbine.
lpl