For some reason I really struggle with most can openers. I can't seem to get the connection right, but think I have, then start off, and they're just grinding away uselessly at the label.
I particularly hate those ones that take the whole top lid section off. I loathe them with a passion because they make me look particularly stupid so not one of those please.
We used to have an electric one on the wall when I was growing up (which must have been minging when I stop to think about it) so perhaps that's why I've literally never got to grips with them.
Any good ones? Lakeland??