The first self-stirring mug I had I picked up a few years ago. It was battery operated, made of plastic and marketed as being ideal for hot chocolate. Long story short, the mug wasn’t powerful to blend most hot chocolate mixes (not if you wanted a lot of chocolate, anyway!) and a pain in the butt to clean because it had big, non-removable blades at the bottom. This Stainless Steel Self-Stirring Mug is a big improvement. This sleek looking mug has a small disk at the bottom that spins rapidly at the touch of a button, easily blending things like sugar and cocoa powder into hot liquids. The mug is battery operated and is fairly strong when the batteries are fresh, and it comes with a lid that makes this a convenient travel mug, not just a gadget to use around the house. Rechargeable batteries are the way to go with a cup like this one, as batteries that have lost some of their juice won’t blend up your drinks as well.
All that said, I still don’t have a self stirring mug to call my own. I did recently gift one of these to a hot chocolate loving friend (who kindly let me give it a try!), so I’d put it on my short list if I were in the market for another similar gadget!