Electric can openers
If you’ve got a medical condition that prevents you from using a crank-type opener, then it makes sense to get a power-driven model. The rest of us can probably get by without yet another appliance.
Some manufacturers, such as Kuhn and Oxo, have manual openers so easy to use they practically operate themselves. They store neatly in kitchen drawers, too, versus joining all those other appliances (bread machine, food processor, coffee grinder, et al.) cluttering up the countertops.
Even if you insist on an electric can opener, you should always have a crank-type model as well. Otherwise you’ll have trouble opening those emergency rations come the ice storm, earthquake or hurricane.