I can say that from 144/165 to 240 or higher is barely noticeable. Back when 240hz monitors were still gaining traction, I visited the Dell booth at ESL One 20

I can say that from 144/165 to 240 or higher is barely noticeable. Back when 240hz monitors were still gaining traction, I visited the Dell booth at ESL One 2018 and they had 2 monitors, side by side, one 144hz and one 240hz. The difference was barely noticeable, if any. Maybe it was an old model and not as good as today's models, but I really don't think it's worth the premium price tag. The jump from 60>75 is already very noticeable, from 60 to 144 is a big difference, unfortunately from 144 to 240 doesn't seem to be the case as the former example.