Apple (MBP15 late 2013, iMac 27 late 2009) user at home, Dell XPS 15 9550 (2015) user at work here.
While I totally agree with you about the new MBP, please just know that the XPS 15 isn't without it's problems too! It must just be that Windows users are more used to lower quality hardware/software that such things are accepted...
I really like my XPS 15 as it is fast and as compact as a MBP, but:
- Microsoft Surface Bluetooth mouse and keyboard don't work anymore after an idle period of maybe 10 minutes. Have to disable/enable Bluetooth to get it working again. I reverted to RF dongle keyboard and use the Surface Mouse with the included USB cable.
- I had a huge number of BSOD early on. It's still not perfect, but almost fine now.
- The web cam is at the worst possible position. It films your fingers and breast, rather than head!
- The microphone is even worse, no one will hear you talking.
- Headphone with microphone works fine. But after unplugging I don't have any sound anymore. Sleep/wake fixes it...
- I obviously do miss some of the Mac apps like OmniFocus, Pixelmator, xScope and others while working in Windows.