It’s easy to make fun of the JarKey, because of the various alternatives. However, I’m with orenwolf – it’s fast, always works, and you can use it while the jar is sitting flat on the counter, which is not always the case with a spoon or knife. There is also an extra-deep version for thick jar lids.
The plastic version will wear down after you’ve opened 500+ lids, so we replaced ours with the metal version: https://www.amazon.com/Brix-2251-JarKey-Metal-Opener/dp/B002YYMMUG
