I just bought a Dell XPS after eight years of Mac use. Zero productivity loss, now I can test pen and touch GUI on the laptop. Can run Linux, can run windows. Honestly, the 4k display is even better than my last Macbook's retina display. Oh, and the Dell's keyboard is much better. The big win: function keys.
Which version did you buy? I bought 9350 (Skylake) when that came out and this really scared me away from XPSes (multiple issues, motherboards replaced, the worst thing being Thunderbolt integration with the TB16 dock). I generally like quick and nice Dell support service but would rather not have to use it.
It took a lot of fiddling to get Linux running on it, but it all works now. I have it set up with 18.04 with the root on ZFS.