I have got a quite an expensive can opener with a lifetime warranty, think it was over $50. However after about 3 years of normal use it wasn't capable of cutting through the can anymore .It is one of those types that cuts through the folded seal, so no sharp edges. I got it replaced. However it happened again after a few years, and then found out they manufacturer no longer distributes in NZ, so they couldn' replace it, and would only offer a refund if I still had the receipt. The problem is also that most people won't keep their receipts longer than 7 -10 years or they fade, and although I had the guarantee and packaging, I didn't still have the receipt for a refund. I also read one manufacturers guarantee where you actually need to supply the original receipt and they wouldn't accept copies!. Not much good if it was a receipt printed on thermal paper which fades.