In effectiveness, it's great in the hands of LEOs and military, because they can use the armor-piercing ammo you can't ever have.
For civilians, it's got a lot of capacity, little recoil, and is supposed to be accurate, but it's not going to serve the intended purpose of going through the thickly layered clothing or vests of bad guys. You can't have the ammo that does that.
If you want something civilian with that much punch, you'd need something in 7.62x25, like a TT-33.
Also around here, ammo for it is a scrabble-grab, if a store gets one or two boxes from FN in, it's gone at whatever price they name. I'd still call it an "exotic" ammo at this point.