So one of the presents I got this year from my parents was 'Conair Massaging Slippers'. Let me just say that as slippers they suck. I tried them on and thought they were ok until I turned them on. They're loud!
I thought I could wear them as just slippers but they kept turning on accidentally because the buttons are on the sides of them. I then went to take the batteries out and discovered it was pretty easy to just pop the whole massager out.
Once out it's small, fairly quiet and feels really good... just not on my feet. :) I wrapped mine in plastic wrap just because there's a bit of glue and stuff that's hard to get off.
I've been using mine non stop since Christmas and even if it breaks there's always the left shoe.