I’ve had a Dell XPS 9550 since around February. It’s a fantastic laptop but there definitely have been teething pains with the Skylake processor and Linux, specifically related to power management.
Today I installed Linux kernel 4.8-rc5 and got a nice surprise vs 4.7.2 which I was running.
That’s quite a bit better than observed with 4.7.2 and far, far better than 4.5.X when I first got the laptop.