I started diagonal flipping in low gold and after I got that consistent, I started adding the cancel. The cancel isn’t really hard, you just have to be fast. I can speed flip pretty consistently now,(although only left side lol) and it is useful for recoveries, and I can dust most people on kickoffs if I don’t mess it up. Overall I’d say it’s useful in low ranks, but not something you should focus on. Speed flips won’t make your rotations better, just faster. Focus on actually improving your rotations instead of just trying to find workarounds. And I agree that most people below diamond probably won’t get it consistent before they get a decent rank if they focus in useful stuff.