I had one in .22 Mag. and it was a handfull. At five yards I could keep it in a 6-inch group. You really have to have a firm grip or it will jump out of your hand. I wouldn't want to get hit by one of those missiles!
I've tried both the magnum model as well as the 22LR, I'd pick the 22LR as it's cheaper to pratic with and try and hit something with, remember this is a close range Bang and See gun anyhow! It's more than a Novelty, but I switched to a Beretta M-21 in 22LR as a lot bette to actually hit something with it! LOL