The women in our family, who don't want to shoot a shotgun prefer this gun to learn how to shoot and later as home protection.
Extra cylinder allows shooters to quickly change from shooting .22 LR to .22 WMR.
http://www.ruger-firearms.com/products/newModelSingleSixConvertible/models.html
I have Ruger Single Six with wooden grips. I bought in in 1984 and still love it. Although it has shot mostly paper, I have gotten a few squirrels and woodchucks with it.