What Scott said... although, I'd imagine if you unloaded the entire magazine of 25 into someone, they will be just a big bloody spot on your walls and floor.
I will say though that it looks just like an AR-15 so you definately have the fear factor if someone sees you walking out of your bedroom with that thing. (especially if you trick it all out with a front tactical grip, a big scope, etc...)
I just have a better comfort with grabbing one of my larger firearms if I'm defending my family as opposed to grabbing a .22LR. Although I will admit, the accuracy seems pretty good on it, so if there are multiple attackers, it might actually be a better choice given my LCP has 6 rounds, my Ruger has 12, my 12ga 5, etc.... so I have 2-4x as many opportunities to put them down given that I have that much more ammo sitting in my magazine.