I used to have an electric can opener. The idea was really neat. You basically attached it to the can like a regular can opener, and when you pressed down on the latch to cut into the lid, the thing would sort of "take off" and start running around the can by its self. If the can was heavy enough you could let go entirely and it would finish the job and wait for you to take it off.

But frankly, it was indeed hard to clean, and I got tired of charging it all the time. I'm much happier with the Oxo. I don't think I'd want one of those swing-away ones because I'd have to find a place for it that didn't bother me too much...