I have had a XPS 15 9550 as my main machine for almost a year now, and I can say I'm disatisfied.
It needs a very specific combinations of driver update and bio flashing to work, charging using USB-C sometimes just stops, making it work with a dock took me a good month to figure out, the battery last only a few hours, the webcam is weirdly placed. Worst of all, the sound has suddenly started to act wildly and is now full of cracks.
Given the price I paid for it (2500 € to include a 1 To hard drive and 32 Gb of RAM), I found it less than satisfactory.
But what is infuriating is that some very big problems (like BSOD level) where brought to the attention to the Dell staff on their support forum and the post have been dormant without clear answer from their part for months.
My previously positive perception of the dell brand have been seriously ternished. This is not just bad manufacturing, it's really bad marketting.