jason I use one on my Mac Mini, but when I use my MacBook Pro I do notice the 120hz display there. Not enough to really care about it but it's one of those "nice to have" features on the studio display. But not at that price!! One could get a M5 Max macbook pro for the same price!
And it looks like the 'base model' studio display got some minor updates too, to the webcam and speakers. No need to upgrade at all.