Chain adjusting tool

I watched a video on these chain slack adjusting tool. Has anyone here ever tried these, or a similar tool? If so, what do you think of them? Even if not, what are your opinions of this type of adjusting tool?

Discover The Revolutionary Chain Slack Adjuster Tool – BPA-RACING

 

I seem to recall some guy posted this up before....

https://vfrworld.com/threads/chain-adjusting-tool.59885/#post-630556

 

over-complicated solution to a simple task.

 

Hey...I was even a contributor on that one....Age eh' fuck. I wished I knew what I had or breakfast so I don't get stuck in the rut having the same thing every day.