"The right tool for the job" comes to mind. I've always been content with tools that required me to change batteries. Whether it was a wrench, pliers, channel locks, vice, etc. I got the job done. Holy cow! This little key sped up the work 10 times. Perfect fit for battery bolts on corners that are no longer round. And for so little $ I'd love to have it in the past. The purchase is definitely worth it.