My experience with XPS's has been mixed.
I have an XPS 13 (2105 model, Core i5) which runs GREAT and is easy for me to look at as long as I keep the display drivers from upgrading. I have to use drivers from 2015 or else they cause immediate pain.
I got an XPS 15 and it hurts to look at. I'm checking the panel manufacturer, because my boss has an XPS 15 and it's very easy to look at. It's also possible he has older drivers, I suspect I may have accidentally put on the latest Intel drivers whereas he probably has the Dell standard ones from our corporate imaging server.
Another coworker has a Precision 15, same chassis and screen, same Intel chip, but a Quadro instead of a GeForce. It also looks great.
I'm going to compare panel manufacturers between the three, but also experiment with drivers to see if I can't get mine back to being comfortable so I can stop using the 13" which is a great little machine but a bit small.