I use Final Cut Pro and after I get done with a video shoot in C-LOG 3 on my Canon R6, I apply the canon Factory LUT on an Adjustment layer in Final cut. From there Ill go to a shot of the Color Checker and apply another adjustment layer where Ill grade the colors precisely to the Vector Scope and white balance.
This color checker takes all the guess work out of color grading by eye, and after you use it, you won't want to go back to eyeballing your color grading and white balance ever again. Ultimately I see it as a huge time saver, and my time is worth more than the price of this important tool. I highly recommend it.