I bought one when I lied to myself and said I'll learn to do this in less than a minute. After 3 weeks I just got an app and solved it. Now I use it as a motivation tool to force me to close all my rings on the Apple Watch - whenever I don't, I move one side per ring not closed, and when I close I can fix it my how many rings I did close.
It edged out my old mark by two seconds ... and 16 minutes ... and 12 hours. I do plan to finish someday!