My 10-year-old is spending more time in the kitchen as an actual helper these days. Last week, she made brownies from a mix all by herself. It was a proud moment.
This week, she wanted to make baked beans, which, of course, entails (1) opening the can, (2) dumping the contents into a bowl, and (3) heating the bowl in the microwave. But we got stuck on Step 1, because I wasn't thrilled with the idea of my daughter's fingers being snagged by a sharp can lid.
The cutting wheel cuts into the side of the can and leaves the can and the lid completely smooth. You can, in fact, use the lid as a cap on the opened can (although you should never store food in opened cans in your fridge).
Some reviewers noted that the opener only lasts a year or two before it becomes ineffective, but maybe Good Cook will address that in a newer model.