
I am a BIG fan of this. I have it permanently on my master bus. Don't let it be the boss of you, but I do find it's really helpful at correcting ear fatigue, or when you just get used to the sound you are building without a frame of reference. In my experience it's best used on the part of the song / cue where most is going on.
Personally I prefer it to A/B mix testers, because it's visual it's unobtrusive.
First time it has ever been free.
https://www.izotope.com/en/products/ton ... rol-2.html