Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Looks great but doesn't work well

I used to have a jar opener like this, but it was mounted to the bottom of my kitchen cabinet. That worked wonderfully because I could use both hands to pull and turn the jar against it. This tool limits you to one hand pushing (with the jar opener) and one hand turning the jar. Unless you can really ram it against the lid, you'll only succeed in gouging the lid, not in actually turning it. If you haven't the hand strength to open the jar without this, chances are this won't help you.