When you hit 70 and your eyes start to go south, any tool that helps is worth it. My dad had me grinding vales for him in 1963, so I've been at this a while. I also resurface the heads. After they run them half a season on one cylinder, they aren't too happy when they find out a head gasket...
Older thread, but if you do a lot of valve adjustments as I do, this little guy is great!
RAMATA Upgrade Top Dead Center Indicator on Amazon, around 12 bucks.
You can an axect 1/4" after with no guesswork.
I used chopsticks for years before I bought this thing.
LOL