Once you’ve had it, there’s no going back. And on a PC it means spending about $150 more on your screen and using a $300+ video card.
Definitely subjective. I enjoy high framerates, but I wouldn't ever trade things like DPI, color, contrast, etc away for it. Actually my biggest beef with external displays right now is that everybody and their brother is pumping out 120/144/240hz displays that are 4k if you're lucky (many stop at 2560x1440) and treat all other specs as afterthoughts or worse.