I use an old swing-a-way that I can toss in the dishpan and wash each time I use it.
I tried electric can openers and always had a difficult time with large coffee cans and small tomato paste cans.
My current gripe is that you cannot remove the bottom of many cans using a can opener.
Soon they will all be pop top cans or plastic pouches, my can opener can hang in the kitchen as a decoration.
The electric ones can sit in basements next to the eight track players and the VCR's!