Ars Technica posted a
review of the XPS 15
Nothing earth shatteringly different then other reviews, so much so, it seems a little odd that it took so long for them to publish a review
In short, the reviewer was very positive about the laptop except about the battery life with the 4k option, and the 4k screen is a little too reflective.
All in all, I've not decided to buy anything yet, less about indecision and more about lack of real need to move on buying anything right now. I have a well running SurfaceBook and my 2012 15" MBP seems to be serviceable in its operation. The only temptation I have is to sell the SurfaceBook now, before MS possibly releases the next generation, but even then, I'm not really worked up about that. I can sit back and wait and I seem to be leaning that way for the time being.