When it comes to can openers there are no universal standards. Like everything else in the kitchen (except maybe the wooden spoon), it's been improved upon and different variations have been made. The options above for example are the models from Giada De Laurentiis and OXO, and a safety edge opener from Zyliss.
With so many different models to choose from it's hard enough to decide which type you want, let alone which brand within the idea. Can opener shopping is not unlike shoe shopping. Although some enjoy it, most folks define it as hell. All the good ones are too expensive and within the board definition of shoes there are dress shoes, athletic shoes, snow boots... well you get the idea. The only difference is when shoe shopping you at least get to try things on before you buy them!
With can openers your purchase is always a shot in the dark (outside of reading online reviews). How do you go about finding the right one? Do you always end up disappointed? Have one you can't live without? Share your thoughts in the comments below!