I've tried this with several different sized cans (ranging from traditional to Costco canned chicken) and this can opener works through them all with no problems. The magnet is strong so the lid won't fall on the counter and make a mess, and the jar seals well to avoid the same problem. I haven't tried a rear knife sharpener yet, but I didn't buy it for that either. (didn't know it existed!) Haven't had it for a very long time but so far so good. If there are any reuse issues I will update the review accordingly. Edit: Checking out almost 2 years later to say this thing still works as it did the day I got it. No complaints!
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