I purchased one on a spare of the moment decision when I was out shopping, mine was of poor quality and falling apart. This is without a doubt the best can opener I have owned in my fifteen years of marriage. It opens evenly and smooth around the can and requires less force with the fingers, this is important for anyone with arthritis in the hands. I do not understand how anyone can have trouble with this. I own two as my sister-in-law purchased one for me as a surprise knowing how poorly mine was operating. I have had them both for two years now and they operate the same way as they did when purchased.
I think this works well and now its been about a year I have had it. I dont know why people are having trouble with it really. maybe you should make sure to have your can on the counter while getting it lines up to clasp on in case you arent, also wash it each time after use and oil it with food safe oil once in a while.~just a thought for whatever it might be worth