I agree.... people act like a 22LR is a bad idea for self defense, but my opinion is, you fire enough of them into a person, they will stop... hell, the normal home intruder that sees a firearm period is going to run for the hills when they see one pulled regardless of it's caliber....
With that being said, my home protection is not a 22LR but a 12ga... but I still don't get why everyone is down on a 22LR... if I need to save my life, I'm not firing one round into someone and stopping... I am unloading the entire mag and grabbing my backup mag right afterwards... and making sure the job is done right so that myself and my family is safe.
but back on topic about the 15/22... I have been contimplating for a while to get one to have fun plunking around since it is WAAAAAAAAY cheaper than 223 amo and I can use most of the same accessories as the AR15 for the "cool" effect. As a matter of fact, I might rent one next weekend at the range and see how I like it as well as maybe check out the 10/22 since I've heard alot of good things about them as well.