Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Inferior

I owned an original swing away can opener that was worn from decades of service so I naturally assumed the product would be near as good. The quality of the one I received is so poor its slips of the wheel and never ever opens or cuts fully around any type of can. It is pretty much useless as it only caves in the edges and occasional cuts partially around and then slips off. What junk!Unfortunately I didn't mount it and try it when I got it as I was still using my 1940's version and will have to go back to it.