The machine was not really usable for professional work.
I now have a Thinkpad X1 Carbon 5th gen. It has no major issues and works reliably, even with Linux as the primary OS. Granted, it was more expensive, but well worth the purchase price.
Thinkpad also appears to use long lasting batteries that hold charge well. I've had 2 think pads, each 6+ years. They still hold battery for hours and hours.
I paid $500 less for my X1C5, bought during the Black Friday sale. It doesn't have a dGPU (that I didn't want anyhow); but does have a WQHD display, WWAN, and a 1 TB Samsung SSD instead of a 512 GB Toshiba. No issues with Linux or OpenBSD, and the keyboard is better than both the current XPS 15/Precision 5520 and my 2013 rMBP 13". (Let's not even think about how hard the current MBPs suck.)
The XPS had failed with ridiculous reason, I try to access the BIOS/UEFI with some key while boot up. After some tries, the machine never boot again. It founds that by pushing F8 in the wrong timing/combination while booting can cause the machine to brick forever. This is beyond the expectation of how any computer should work !
http://en.community.dell.com/support-forums/laptop/f/3518/t/...